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https://issues.apache.org/jira/browse/FLEX-35028?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Justin Mclean reassigned FLEX-35028:
------------------------------------

    Assignee: Justin Mclean

> Error in DataGrid getHeaderRendererAt(-1)
> -----------------------------------------
>
>                 Key: FLEX-35028
>                 URL: https://issues.apache.org/jira/browse/FLEX-35028
>             Project: Apache Flex
>          Issue Type: Bug
>          Components: Spark: DataGrid
>            Reporter: Judah Frangipane
>            Assignee: Justin Mclean
>
> When using a DataGrid if you click the header and the column index is -1 then 
> an error is thrown: 
> {code:actionscript}
>     // line 917 in GridColumnHeaderGroup.as: 
>     public function getHeaderRendererAt(columnIndex:int):IGridItemRenderer
>     {
>         // TODO: fix this: do the work here, rather than the layout           
>  
>               const view:Group = getColumnHeaderViewAtIndex(columnIndex);     
>         return 
> GridHeaderViewLayout(view.layout).getHeaderRendererAt(columnIndex);
>     }
> {code}
> Apparently the columnIndex is -1 when clicking on the header. 
> Solution may be to check if index is not -1 and return null if it is
> Alternative solution would be check for -1 in gchg_mouseDownDragUpHandler at 
> line 1112 and not dispatch an event. 



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