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https://issues.apache.org/jira/browse/FLEX-33824?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13797592#comment-13797592
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Alex Harui commented on FLEX-33824:
-----------------------------------
Reproduced. When DG is re-added to the display list, the ColumnHeaderGroup's
nestLevel trick doesn't work right. It gets put in the LayoutManager queue
before it gets its nestLevel re-assigned. Proposed fix is to call validateNow
on ColumnHeaderGroup before upping the nestLevel to remove it from the
LayoutManager queue. Upping the nestLevel will put it back in the queue at the
right level.
Will now try to fashion a workaround.
> Disappearing spark DataGrid columns when we set dataProvider to null
> --------------------------------------------------------------------
>
> Key: FLEX-33824
> URL: https://issues.apache.org/jira/browse/FLEX-33824
> Project: Apache Flex
> Issue Type: Bug
> Components: Spark: DataGrid
> Affects Versions: Apache Flex 4.10.0
> Environment: Windows 7 64bit, Adobe Air 2.6
> Reporter: Piotr Zarzycki
> Assignee: Alex Harui
>
> This is an example of an application with problems we have noticed on our
> main appliaction.
> Instructions:
> We've got 2 views added dynamically to app.
> 1) Click on button "View 1" - DataGrid looks Ok (fill dataProvider on
> ADDED_TO_STAGE event)
> 2) Click on button "View 2" - DataGrid still looks Ok (set null to View 1's
> dataProvider on REMOVED_FROM_STAGE event)
> 3) Click once again on button with "View 1" - Columns in DataGrid
> accidentally disappear) -> http://bit.ly/GORcrb
> 4) Roll over on data grid's header and everything is back to normal - columns
> appearing
> Link to example app (zip, Intellij IDEA project) -> http://bit.ly/16cOemT
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