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https://issues.apache.org/jira/browse/FLEX-32599?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13721571#comment-13721571
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Cyrill Zadra commented on FLEX-32599:
-------------------------------------
Just run into this error with Apache Flex 4.10.0
1) Compile example and run.
2) Click on VerticalScrollbar
3) mouseOver on dataGrid and following error occurs.
TypeError: Error #1009: Cannot access a property or method of a null object
reference.
at
mx.controls::AdvancedDataGrid/findHeaderRenderer()[/Users/justinmclean/Documents/ApacheFlex4.10/frameworks/projects/advancedgrids/src/mx/controls/AdvancedDataGrid.as:5876]
at
mx.controls::AdvancedDataGridBaseEx/mouseEventToItemRenderer()[/Users/justinmclean/Documents/ApacheFlex4.10/frameworks/projects/advancedgrids/src/mx/controls/AdvancedDataGridBaseEx.as:2690]
at
mx.controls::AdvancedDataGrid/mouseEventToItemRenderer()[/Users/justinmclean/Documents/ApacheFlex4.10/frameworks/projects/advancedgrids/src/mx/controls/AdvancedDataGrid.as:2148]
at
mx.controls::AdvancedDataGrid/mouseOverHandler()[/Users/justinmclean/Documents/ApacheFlex4.10/frameworks/projects/advancedgrids/src/mx/controls/AdvancedDataGrid.as:8426]
Can anyone else reproduce this error? With apache flex 4.9.1 it works.
Example Code
<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009";
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx"
minWidth="955" minHeight="600">
<mx:AdvancedDataGrid width="40%" height="50%"
horizontalScrollPolicy="on">
<mx:columns>
<mx:AdvancedDataGridColumn width="100"
dataField="field1" headerText="Field 1" />
<mx:AdvancedDataGridColumn width="100"
dataField="field2" headerText="Field 2" />
<mx:AdvancedDataGridColumn width="100"
dataField="field3" headerText="Field 3" />
<mx:AdvancedDataGridColumn width="100"
dataField="field4" headerText="Field 4" />
<mx:AdvancedDataGridColumn width="100"
dataField="field5" headerText="Field 5" />
<mx:AdvancedDataGridColumn width="100"
dataField="field6" headerText="Field 6" />
<mx:AdvancedDataGridColumn width="100"
dataField="field7" headerText="Field 7" />
<mx:AdvancedDataGridColumn width="100"
dataField="field8" headerText="Field 8" />
<mx:AdvancedDataGridColumn width="100"
dataField="field9" headerText="Field 9" />
<mx:AdvancedDataGridColumn width="100"
dataField="field10" headerText="Field 10" />
<mx:AdvancedDataGridColumn width="100"
dataField="field11" headerText="Field 11" />
</mx:columns>
</mx:AdvancedDataGrid>
</s:Application>
> TypeError: Error #1009: Cannot access a property or method of a null object
> reference.at
> mx.controls::AdvancedDataGrid/findHeaderRenderer()mx.controls::AdvancedDataGrid/mouseEventToItemRenderer()
> ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: FLEX-32599
> URL: https://issues.apache.org/jira/browse/FLEX-32599
> Project: Apache Flex
> Issue Type: Bug
> Components: Advanced Data Grid
> Affects Versions: Adobe Flex SDK Previous
> Environment: Affected OS(s): Windows
> Affected OS(s):
> Language Found: English
> Reporter: Adobe JIRA
> Assignee: Justin Mclean
> Priority: Minor
> Fix For: Apache Flex 4.10.0
>
>
> Steps to reproduce:
> 1. Columns created
> 2. dataProvider is initializing
> 3. moving to header of the grid then error occured.
>
> Actual Results:
> runtime error occured
> TypeError: Error #1009: Cannot access a property or method of a null object
> reference.
> at mx.controls::AdvancedDataGrid/findHeaderRenderer()
> at mx.controls::AdvancedDataGrid/mouseEventToItemRenderer()
> at mx.controls.listClasses::AdvancedListBase/mouseMoveHandler()
>
> Expected Results:
> no error should be occur.
>
> Workaround (if any):
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