[ https://issues.apache.org/jira/browse/FLEX-33678?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Alex Harui updated FLEX-33678:
------------------------------

    Attachment: VScrollBar.as

This seems to fix the problem.  The ScrollBar will wait to fix up its settings until after the child/viewport has its measurements.
                
> DataGrid VerticalScrollBar disappears in CallOut or on StateChange in 4.10.0
> ----------------------------------------------------------------------------
>
>                 Key: FLEX-33678
>                 URL: https://issues.apache.org/jira/browse/FLEX-33678
>             Project: Apache Flex
>          Issue Type: Bug
>          Components: Spark: CalloutButton, Spark: DataGrid, States
>    Affects Versions: Apache Flex 4.10.0
>         Environment: Tested on Mac OSx and Windows in browser and air.
>            Reporter: Swen van Zanten
>            Assignee: Alex Harui
>              Labels: datagrid, scroller
>             Fix For: Apache Flex 4.11.0
>
>         Attachments: DataGridBug2.mxml, DataGridBug2.swf, DataGridBug.html, DataGridBug.swf, expressInstall.swf, Main-app.xml, Main.mxml, swfobject.js, VScrollBar.as
>
>   Original Estimate: 168h
>  Remaining Estimate: 168h
>
> When the datagrid is created it has the vertical scrollbar. When you either change the state of the component where the datagrid is created the scrollbar disappears. Also in a new calloutbutton container the first open (so when the grid is created) it has the scrollbar and then on a reopen it is gone.
> The container of the scrollbar is there, but the thumb is gone.
> Tested the application on 4.9.1 and the problem was gone.
> I will upload a sample project.

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