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https://issues.apache.org/jira/browse/FLEX-20617?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14639893#comment-14639893
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steve commented on FLEX-20617:
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you can dispatch event manually.
eg)
myCombobox.selectedIndex = 2;
myCombobox.dispatchEvent (new ListEvent(ListEvent.CHANGE));
> ComboBox does not dispatch change event when selectedIndex is set
> programmatically
> ----------------------------------------------------------------------------------
>
> Key: FLEX-20617
> URL: https://issues.apache.org/jira/browse/FLEX-20617
> Project: Apache Flex
> Issue Type: Bug
> Components: mx: ComboBox
> Affects Versions: Adobe Flex SDK 3.0 (Release)
> Environment: Affected OS(s): Windows
> Affected OS(s): Windows XP
> Browser: Firefox 3.x
> Language Found: English
> Reporter: Adobe JIRA
> Assignee: Adobe JIRA
>
> Steps to reproduce:
> 1. Run the attached SWF or compile and run the attached MXML file
> 2. Click on the button labeled "set CB selectedIndex" and/or "set CB
> selectedItem"
> 3. Note the number of change events dispatched as indicated by the label
>
> Actual Results:
> Setting selectedIndex and/or selectedItem on a ComboBox does not dispatch the
> change event.
> (NOTE: Setting the same properties on Spark DropDownList does dispatch the
> change event).
>
> Expected Results:
> ComboBox should dispatch the change event when selectedIndex or selectedItem
> is set.
> ASDoc for ComboBox change event says:
> [change event] Dispatched when the ComboBox contents changes as a result of
> user interaction, when the selectedIndex or selectedItem property changes,
> and, if the ComboBox control is editable, each time a keystroke is entered in
> the box.
>
> Workaround (if any):
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