Applying behaviors in MXML using data binding

            
<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
    <mx:Zoom id="mZoom" zoomHeightTo="{Number(zoomHeightInput.text)}" zoomWidthTo="{Number(zoomWidthInput.text)}" />
    <mx:TextInput id="zoomHeightInput" text="1.0" />
    <mx:TextInput id="zoomWidthInput" text="1.0" />
    <mx:Button rollOverEffect="{mZoom}" />
</mx:Application>

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Applying behaviors in MXML using data binding : Data Binding « Data Model « Flex

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