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Get child count in TabNavigator

<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">     <mx:Canvas width="400" height="300">         <mx:Script>                              import mx.core.UIComponent;                      public function get tabNumChildren():Number{                     return navigator.numChildren;                 }                         </mx:Script>         <mx:TabNavigator id="navigator">              </mx:TabNavigator>     </mx:Canvas> </mx:Application>