[flexcoders] advanced datagrid in popped up titlewindow issue

[Paul Hastings]

i have a flex (3.5 SDK) advanced datagird that works fine in the app's
main layout but when moved into a popup titlewindow it won't fill with
data. a normal datagrid in the same titlewindow component using the
same datasource works fine.

component creation & data passed in:

idResultWindow=IdentifyResultWindow(PopUpManager.createPopUp(this,IdentifyResultWindow,false));
idResultWindow.dataSource=featureAttributes;                    


datagrid in question (in idResultWindow):

<mx:AdvancedDataGrid x="10" y="10"
                id="attributesData"
                initialize="layerGroup.refresh();"
                width="100%" height="100%">
    <mx:dataProvider>
            <mx:GroupingCollection id="layerGroup" source="{dataSource}">
                <mx:grouping>
                    <mx:Grouping>
                        <mx:GroupingField name="layer"/>
                    </mx:Grouping>
                </mx:grouping>
            </mx:GroupingCollection>
        </mx:dataProvider>
                <mx:columns>
                        <mx:AdvancedDataGridColumn headerText="" 
dataField="attribute"/>
                        <mx:AdvancedDataGridColumn headerText="" 
dataField="value"/>
                </mx:columns>
</mx:AdvancedDataGrid>

gone blind looking thru these few lines of code & now kind of stumped,
anyone have any ideas?

thanks.