problem with mx:DataGrid and custom itemRenderer using view states

Jason Guild Mon, 14 Jul 2014 17:59:21 -0700

Hi All:

I've encountered an intermittant stack overflow problem displaying datain an <mx:DataGrid> with two colunms, variableRowHeight="true", and acustom itemRenderer applied to the second column. The item renderer forthe second column is based on <mx:Box> and has two view states. Therenderer is either in the "default" state and shows wrapped text, or ina "link" state and the text is a hyperlink where an <mx:Button> to bedisplayed instead.

My interface combines an <mx:Tree> beside an <mx:DataGrid> in a simplemaster/detail configuration. Selecting an item in the tree resets thegrid dataProvider to show detailed data in the grid for thecorresponding tree item. The MXML for the interface is:

<mx:DividedBox id="resultsBox" width="100%" height="100%"direction="horizontal">

    <mx:Tree id="resultTree" width="37%" height="100%" minWidth="100"
             styleName="layerTreeStyle"
             doubleClickEnabled="true"
             dataProvider="{ viewModel.results }"/>

    <mx:DataGrid id="attrGrid"
                 width="63%"
                 minWidth="125"
                 height="100%"
                 variableRowHeight="true"
                 draggableColumns="false"
                 sortableColumns="false"
                 editable="false">
        <mx:columns>

<mx:DataGridColumn headerText="Field" dataField="field"width="100"/><mx:DataGridColumn headerText="Value" dataField="value"width="125"

 itemRenderer="views.renderers.ResultSummaryValueRenderer"/>
        </mx:columns>
    </mx:DataGrid>
</mx:DividedBox>

The itemRenderer looks like this:

<?xml version="1.0" encoding="utf-8"?>
<mx:Box xmlns:fx="http://ns.adobe.com/mxml/2009";
        xmlns:mx="library://ns.adobe.com/flex/mx"
        implements="mx.core.IDataRenderer"
        width="100%"
        paddingLeft="5">

    <fx:Script>
        <![CDATA[
            import events.ResultLinkEvent;
            import mx.events.FlexEvent;
            import util.StringUtil;

            private const linkMethodPat:RegExp = /(ht|f)tp(s?):/i;

            private var _data:Object;

            [Bindable]
            private var displayVal:String = null;
            [Bindable]
            private var displayTip:String = null;

            [Bindable("dataChange")]
            public override function get data():Object {
                return _data;
            }

            public override function set data(value:Object):void {

                if ((this._data = value) != null) {
                    if (isLink(value)) {
                        var valStr:String = data.value as String;
                        var sepIndex:int = valStr.indexOf("|");

this.displayVal = (sepIndex >= 0) ?valStr.substring(0, sepIndex) : "Link";

                        this.displayTip = valStr.substring(sepIndex + 1);
                        this.currentState = "link";
                        return;
                    }

this.displayVal = ("value" in data &&StringUtil.isNotBlank(data.value)) ? data.value : "[ no value ]";

                    this.displayTip = null;
                    this.currentState = "default";
                }

                dispatchEvent(new FlexEvent(FlexEvent.DATA_CHANGE));
            }

            private function isLink(attrInfo:Object):Boolean {
                var sepIndex:int = attrInfo.value.indexOf("|");

var attrVal:String = (sepIndex == -1) ? attrInfo.value: String(attrInfo.value).substring(sepIndex);


                // return true if value is URL with recognized method

return (attrVal.substring(0,attrVal.indexOf('//')).match(linkMethodPat) != null);

            }

            private function notifyLink(evt:MouseEvent):void {
                var attrVal:String = data.value as String;
                var sepIndex:int = attrVal.indexOf("|");

                dispatchEvent(new ResultLinkEvent(
                    ResultLinkEvent.NAVIGATE,
                    data.field,

(sepIndex == -1) ? attrVal :attrVal.substring(sepIndex + 1)

                    )
                );
            }
        ]]>
    </fx:Script>

    <mx:states>
        <mx:State name="default"/>
        <mx:State name="link"/>
    </mx:states>

    <mx:Text id="attrTextCtrl" width="100%"
             text="{ displayVal }" selectable="true" excludeFrom="link"/>

<mx:Button id="attrButtonCtrl" label="{ displayVal }" toolTip="{displayTip }"

               click="notifyLink(event)" includeIn="link"/>
</mx:Box>

THE PROBLEM:

At first, when the tree selection changes the grid updates correctlywith new grid content and content is displayed in the second column aseither wrapped text or button as desired. But after an indeterminatenumber of tree selection changes the player will freeze and result inlayout-related stack overflow of some kind.

The grid dataProvider always has about 6-12 rows, but the content itselfvaries somewhat in how many of those rows have text long enough to wrapin the grid when tree selection changes. There is nearly always morecontent than can be displayed vertically so the grid has to display ascroll bar.

I wrote that the stack overflow is intermittant because it /seems/ thatif the grid content can be displayed completely without need for ascroll bar then the problem does not occur. This is often the case whenthere is only one row requiring text wrapping in the itemRenderer.

Anyway, stack traces I have (see below) indicate some kind of loop thatoccurs attempting to validate and update the display lists of the gridand the item renderer used until stack is exhausted. Seems like a bug.


Things I've tried to workaround the problem:

1. setting horizontalScrollPolicy="off" verticalScrollPolicy="off"inside item renderer -> no effect, problem persists2. basing itemRenderer on <s:MXDataGridItemRenderer/> with no layoutinstead of <mx:Box/> -> problem persists3. basing itemRenderer on <s:MXDataGridItemRenderer/> with<s:HorizontalLayout/> instead of <mx:Box/> -> problem persists4. setting variableRowHeight="false" on grid -> problem eliminated, butlong text is not wrapped (undesired visual outcome)5. removing itemRenderer on second column -> problem eliminated, but iseffectively equivalent to variableRowHeight="false" because default

DataGridItemRenderer class never wraps text (undesired visual outcome).

6. Using a bare minimum itemRenderer based on <mx:Box/> involving only<mx:Text> for wrapped text and no view states -> problem eliminated, butits not possible to display a button when content is a hyperlink.7. Using an itemRenderer based on <mx:Box/> that avoids view statesaltogether and tries to toggle which control is visible through settingof visible and includeInLayout -> seemed better at first, but problempersists8. I also tried to extend DataGridColumn to conditionally use twodifferent itemRenderers based on the data, butDataGridColumn.getItemRendererFactory() calls private methods I can'toverride without bringing the whole class into my tree.


QUESTIONS:

1. Is there another way to write an item renderer with switching viewstates in a way that is more robust?2. How does <mx:DataGrid> compute the needed height for a row? Can Ibreak the chain somehow by implementing measure() or something?


Any help or suggestions would be greatly appreciated!!!
Jason

P.S. STACK TRACES:
itemRenderer based on mx:Box --
undefined

atmx.core::LayoutElementUIComponentUtils$/getPreferredUBoundsHeight()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/framework/src/mx/core/LayoutElementUIComponentUtils.as:92]atmx.core::LayoutElementUIComponentUtils$/setLayoutBoundsSize()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/framework/src/mx/core/LayoutElementUIComponentUtils.as:510]atmx.core::UIComponent/setLayoutBoundsSize()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/framework/src/mx/core/UIComponent.as:14474]atspark.layouts::BasicLayout/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/spark/src/spark/layouts/BasicLayout.as:508]atspark.components.supportClasses::GroupBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/spark/src/spark/components/supportClasses/GroupBase.as:1302]atspark.components::Group/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/spark/src/spark/components/Group.as:1179]atmx.core::UIComponent/validateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/framework/src/mx/core/UIComponent.as:9531]atspark.components::Group/validateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/spark/src/spark/components/Group.as:1101]atmx.managers::LayoutManager/validateClient()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/framework/src/mx/managers/LayoutManager.as:1041]atmx.core::UIComponent/validateNow()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/framework/src/mx/core/UIComponent.as:8609]atmx.controls.dataGridClasses::DataGridBase/updateRendererDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:1344]atmx.controls.dataGridClasses::DataGridBase/drawItem()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:1309]atmx.controls.dataGridClasses::DataGridBase/drawVisibleItem()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:1282]atmx.controls.dataGridClasses::DataGridBase/makeRows()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:818]atmx.controls.dataGridClasses::DataGridBase/makeRowsAndColumns()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:702]atmx.controls::DataGrid/makeRowsAndColumns()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:1882]atmx.controls.listClasses::ListBase/makeRowsAndColumnsWithExtraRows()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/listClasses/ListBase.as:1747]atmx.controls.listClasses::ListBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/listClasses/ListBase.as:4388]atmx.controls.dataGridClasses::DataGridBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:690]atmx.controls::DataGrid/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:1781]atmx.core::ScrollControlBase/setScrollBarProperties()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/core/ScrollControlBase.as:1286]atmx.controls::DataGrid/configureScrollBars()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:2437]atmx.controls.listClasses::ListBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/listClasses/ListBase.as:4402]atmx.controls.dataGridClasses::DataGridBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:690]atmx.controls::DataGrid/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:1781]atmx.core::ScrollControlBase/setScrollBarProperties()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/core/ScrollControlBase.as:1286]atmx.controls::DataGrid/configureScrollBars()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:2437]atmx.controls.listClasses::ListBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/listClasses/ListBase.as:4402]atmx.controls.dataGridClasses::DataGridBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:690]atmx.controls::DataGrid/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:1781]atmx.core::ScrollControlBase/setScrollBarProperties()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/core/ScrollControlBase.as:1286]atmx.controls::DataGrid/configureScrollBars()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:2437]atmx.controls.listClasses::ListBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/listClasses/ListBase.as:4402]atmx.controls.dataGridClasses::DataGridBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:690]atmx.controls::DataGrid/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:1781]atmx.core::ScrollControlBase/setScrollBarProperties()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/core/ScrollControlBase.as:1286]atmx.controls::DataGrid/configureScrollBars()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:2437]atmx.controls.listClasses::ListBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/listClasses/ListBase.as:4402]atmx.controls.dataGridClasses::DataGridBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:690]atmx.controls::DataGrid/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:1781]atmx.core::ScrollControlBase/setScrollBarProperties()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/core/ScrollControlBase.as:1286]atmx.controls::DataGrid/configureScrollBars()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:2437]atmx.controls.listClasses::ListBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/listClasses/ListBase.as:4402]atmx.controls.dataGridClasses::DataGridBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:690]atmx.controls::DataGrid/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:1781]atmx.core::ScrollControlBase/setScrollBarProperties()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/core/ScrollControlBase.as:1286]atmx.controls::DataGrid/configureScrollBars()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:2437]atmx.controls.listClasses::ListBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/listClasses/ListBase.as:4402]atmx.controls.dataGridClasses::DataGridBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:690]atmx.controls::DataGrid/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:1781]atmx.core::ScrollControlBase/setScrollBarProperties()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/core/ScrollControlBase.as:1286]atmx.controls::DataGrid/configureScrollBars()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:2437]atmx.controls.listClasses::ListBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/listClasses/ListBase.as:4402]atmx.controls.dataGridClasses::DataGridBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:690]atmx.controls::DataGrid/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:1781]atmx.core::ScrollControlBase/setScrollBarProperties()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/core/ScrollControlBase.as:1286]atmx.controls::DataGrid/configureScrollBars()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:2437]atmx.controls.listClasses::ListBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/listClasses/ListBase.as:4402]atmx.controls.dataGridClasses::DataGridBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:690]atmx.controls::DataGrid/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:1781]atmx.core::ScrollControlBase/setScrollBarProperties()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/core/ScrollControlBase.as:1286]atmx.controls::DataGrid/configureScrollBars()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:2437]atmx.controls.listClasses::ListBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/listClasses/ListBase.as:4402]atmx.controls.dataGridClasses::DataGridBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:690]


itemRenderer based on s:MXDataGridItemRenderer:
undefined

atmx.managers::LayoutManager/invalidateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/framework/src/mx/managers/LayoutManager.as:556]atmx.core::UIComponent/invalidateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/framework/src/mx/core/UIComponent.as:8433]atmx.core::UIComponent/setActualSize()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/framework/src/mx/core/UIComponent.as:10250]atmx.core::LayoutElementUIComponentUtils$/setLayoutBoundsSize()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/framework/src/mx/core/LayoutElementUIComponentUtils.as:519]atmx.core::UIComponent/setLayoutBoundsSize()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/framework/src/mx/core/UIComponent.as:14474]atspark.layouts::BasicLayout/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/spark/src/spark/layouts/BasicLayout.as:508]atspark.components.supportClasses::GroupBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/spark/src/spark/components/supportClasses/GroupBase.as:1302]atspark.components::Group/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/spark/src/spark/components/Group.as:1179]atmx.core::UIComponent/validateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/framework/src/mx/core/UIComponent.as:9531]atspark.components::Group/validateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/spark/src/spark/components/Group.as:1101]atmx.managers::LayoutManager/validateClient()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/framework/src/mx/managers/LayoutManager.as:1041]atmx.core::UIComponent/validateNow()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/framework/src/mx/core/UIComponent.as:8609]atmx.controls.dataGridClasses::DataGridBase/updateRendererDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:1344]atmx.controls.dataGridClasses::DataGridBase/drawItem()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:1309]atmx.controls.dataGridClasses::DataGridBase/drawVisibleItem()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:1282]atmx.controls.dataGridClasses::DataGridBase/makeRows()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:818]atmx.controls.dataGridClasses::DataGridBase/makeRowsAndColumns()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:702]atmx.controls::DataGrid/makeRowsAndColumns()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:1882]atmx.controls.listClasses::ListBase/makeRowsAndColumnsWithExtraRows()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/listClasses/ListBase.as:1747]atmx.controls.listClasses::ListBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/listClasses/ListBase.as:4388]atmx.controls.dataGridClasses::DataGridBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:690]atmx.controls::DataGrid/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:1781]atmx.core::ScrollControlBase/setScrollBarProperties()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/core/ScrollControlBase.as:1286]atmx.controls::DataGrid/configureScrollBars()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:2437]atmx.controls.listClasses::ListBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/listClasses/ListBase.as:4402]atmx.controls.dataGridClasses::DataGridBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:690]atmx.controls::DataGrid/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:1781]atmx.core::ScrollControlBase/setScrollBarProperties()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/core/ScrollControlBase.as:1286]atmx.controls::DataGrid/configureScrollBars()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:2437]atmx.controls.listClasses::ListBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/listClasses/ListBase.as:4402]atmx.controls.dataGridClasses::DataGridBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:690]atmx.controls::DataGrid/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:1781]atmx.core::ScrollControlBase/setScrollBarProperties()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/core/ScrollControlBase.as:1286]atmx.controls::DataGrid/configureScrollBars()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:2437]atmx.controls.listClasses::ListBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/listClasses/ListBase.as:4402]atmx.controls.dataGridClasses::DataGridBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:690]atmx.controls::DataGrid/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:1781]atmx.core::ScrollControlBase/setScrollBarProperties()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/core/ScrollControlBase.as:1286]atmx.controls::DataGrid/configureScrollBars()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:2437]atmx.controls.listClasses::ListBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/listClasses/ListBase.as:4402]atmx.controls.dataGridClasses::DataGridBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:690]atmx.controls::DataGrid/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:1781]atmx.core::ScrollControlBase/setScrollBarProperties()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/core/ScrollControlBase.as:1286]atmx.controls::DataGrid/configureScrollBars()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:2437]atmx.controls.listClasses::ListBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/listClasses/ListBase.as:4402]atmx.controls.dataGridClasses::DataGridBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:690]atmx.controls::DataGrid/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:1781]atmx.core::ScrollControlBase/setScrollBarProperties()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/core/ScrollControlBase.as:1286]atmx.controls::DataGrid/configureScrollBars()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:2437]atmx.controls.listClasses::ListBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/listClasses/ListBase.as:4402]atmx.controls.dataGridClasses::DataGridBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:690]atmx.controls::DataGrid/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:1781]atmx.core::ScrollControlBase/setScrollBarProperties()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/core/ScrollControlBase.as:1286]atmx.controls::DataGrid/configureScrollBars()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:2437]atmx.controls.listClasses::ListBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/listClasses/ListBase.as:4402]atmx.controls.dataGridClasses::DataGridBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:690]atmx.controls::DataGrid/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:1781]atmx.core::ScrollControlBase/setScrollBarProperties()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/core/ScrollControlBase.as:1286]atmx.controls::DataGrid/configureScrollBars()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:2437]atmx.controls.listClasses::ListBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/listClasses/ListBase.as:4402]atmx.controls.dataGridClasses::DataGridBase/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/dataGridClasses/DataGridBase.as:690]atmx.controls::DataGrid/updateDisplayList()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:1781]atmx.core::ScrollControlBase/setScrollBarProperties()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/core/ScrollControlBase.as:1286]atmx.controls::DataGrid/configureScrollBars()[/Users/aharui/flex-sdk-4.12.1/frameworks/projects/mx/src/mx/controls/DataGrid.as:2437]

problem with mx:DataGrid and custom itemRenderer using view states

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