It worked.
I missed event.preventDefault(); inside my custom method
private function keyFocusChangeHandler(event:FocusEvent):void {
var advancedDataGridHeaderInfo:AdvancedDataGridHeaderInfo =
visibleHeaderInfos[2];
var itemHeaderRenderer:Object = advancedDataGridHeaderInfo.headerItem;
IFocusManagerComponent((itemHeaderRenderer as
FilterHeaderRenderer)).setFocus();
* event.preventDefault(); // is required*
}
--
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