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I've got a problem while migrating my TabNavigator from Flex 3 to Flex 4.5. Stripped to the bare minimum the following code will produce the bug, namely that the second child of the TabNavigator fails to be created properly: <?xml version="1.0" encoding="utf-8"?> <s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/mx" > <fx:Script> <![CDATA[ protected function over():void { trace('over'); } protected function content_one_init():void { content_one.enabled = true; navigator.selectedIndex = 1; } ]]> </fx:Script> <mx:TabNavigator id="navigator" creationPolicy="auto" width="100%" height="100%" > <mx:VBox id="content_one" enabled="false" creationComplete="content_one_init()" label="One" mouseOver="over()" /> <mx:VBox label="Two"> <mx:Label text="Content Two" /> </mx:VBox> </mx:TabNavigator> </s:Application> What I see, upon launching, is a TabNavigator with its second tab selected but no content instead of the expected "Content Two" label. The navigator.selectedIndex = 1; instruction is there just for comfort, the bug appears also if you select the second tab with the mouse after launching. Now comes the fun part: if I do any of the following, the second child gets created: set creationPolicy="all" on content_one (this is expected), comment content_one.enabled = true , remove enabled="false" on content_one, remove mouseOver="over()" from content_one (this one is re

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