Bind ComboBox and TextInput and Text
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
<mx:Script>
[Bindable]
private var bindableText:String = "";
private function setText():void
{
bindableText = String(cb.selectedItem);
}
</mx:Script>
<mx:VBox>
<mx:ComboBox id="cb" dataProvider="{['A', 'B', 'C', 'D']}" change="setText()"/>
<mx:TextInput id="inputFromCB" width="200" text="{bindableText}"/>
<mx:Text id="textFromCB" width="200" text="{inputFromCB.text}"/>
</mx:VBox>
</mx:Application>
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