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Code from Flex 4 Documentation "Using Adobe Flex 4".
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<!-- behaviors\PanelDissolve.mxml -->
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:mx="library://ns.adobe.com/flex/mx" xmlns:s="library://ns.adobe.com/flex/spark"
creationComplete="init();">
<s:layout>
<s:VerticalLayout />
</s:layout>
<fx:Script>
import mx.geom.*;
// Define a bounding box for the target area of the effect.
[Bindable]
public var tArea:RoundedRectangle;
// Size the bounding box to the size of Panel 2.
private function init():void
{
tArea = new RoundedRectangle(0,0, panel2.width, panel2.height, 5);
}
</fx:Script>
<fx:Declarations>
<mx:Dissolve id="dissolveP1" duration="1000" target="{panel1}"
alphaFrom="1.0" alphaTo="0.0" />
<!-- Apply the effect to the bounding box, not to Panel 2. -->
<mx:Dissolve id="dissolveP2" duration="1000" target="{panel2}"
alphaFrom="1.0" alphaTo="0.0" targetArea="{tArea}" />
</fx:Declarations>
<mx:Panel id="panel1" title="Panel 1" width="100" height="140">
<mx:Button label="Orange" />
</mx:Panel>
<mx:Panel id="panel2" title="Panel 2" width="100" height="140">
<mx:Button label="Red" />
</mx:Panel>
<mx:Button label="Dissolve Panel 1" click="dissolveP1.end();dissolveP1.play();" />
<mx:Button label="Dissolve Panel 2" click="dissolveP2.end();dissolveP2.play();" />
</s:Application>
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