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Bind the Selected Index of a ViewStack to a Variable

<mx:Application     xmlns:mx="http://www.adobe.com/2006/mxml"     layout="absolute">      <mx:Canvas xmlns:mx="http://www.adobe.com/2006/mxml" width="400" height="300" click="changeViewStack()">     <mx:Script>                      [Bindable]             private var selectedIndexInt:int = 0;             private function changeViewStack():void             {                 if(selectedIndexInt == 2)                 {                     selectedIndexInt = 0;                 }                 else                 {                     selectedIndexInt++;                 }             }            </mx:Script>     <mx:ViewStack selectedIndex="{selectedIndexInt}">         <mx:HBox height="{this.height}" width="{this.width}">             <mx:Label text="First View Item"/>         </mx:HBox>         <mx:VBox height="{this.height}" width="{this.width}">             <mx:Label text="Second View Item"/>         </mx:VBox>         <mx:Canvas height="{this.height}" width="{this.width}">             <mx:Label text="Third View Item"/>         </mx:Canvas>     </mx:ViewStack> </mx:Canvas> </mx:Application>