How do I update an mxml property dynamically in Flex?

Note: edited to reflect feedback Since you're using Flex 4, you should probably do this with a skin and States within the skin. But if you want to do it through code, try something like this: protected var _allowClose:Boolean=true; protected var _allowCloseChanged::Boolean=true; protected var _closeButton:Sprite = new Sprite(); public function get allowClose():Boolean { return _allowClose; } public function set allowClose(value:Boolean):void { if (value! = _allowClose) { _allowClose=value; _allowCloseChanged=true; invalidateProperties(); } } override protected function commitProperties():void { if (_allowCloseChanged) { if (_allowClosed) { titlebar.

AddChild(_closeButton); drawCloseButton(true); } else { titleBar. RemoveChild(_closeButton); } //you need to set this back false...sorry I left that out _allowCloseChanged=false; } super. CommitProperties(); } Note: in this case, you no longer need to override createChildren.

I'm investigating your solution as we speak, it appears to be called correctly, but the rest of my code (that I didn't include in the snippet) that should happen inside near the "drawCloseButton" code, is currently failing, so i'm fixing that first.. – Tominator Sep 29 '11 at 13:39 Joy, it works! (I had to fiddle a bit with my own code. ) Two things however: commitProperties should be "protected override" instead of "public", and inside the "if (_allowCloseChanged) {" should be a "_allowCloseChanged = false;" Thanks!

– Tominator Sep 29 '11 at 14:06 Sorry, wrote this too early in the morning :). The reason you had to change it to (!_allowCloseChanged) is because I forgot to set it back false in the commitProperties. You want to run that code whenever _allowClose changes (hence the flag), not every time commitProperties runs (which is often).

– Amy Blankenship Sep 29 '11 at 16:59.

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