Flex TabNavigator Tab

1. 可正确初始化TabNavigator Tab页子控件。

   1）creationPolicy="auto"

   2）creationComplete()函数添加以下代码：

   //-----------------------------------------------------------
   //初始化Tab页子控件
   //-----------------------------------------------------------
				
   var childCount:int = nvgEmp.getChildren().length;
   trace("Tab页个数：" + childCount);
				
   for (var i:int = 0; i < childCount; i++)
   {
       var canvas:Canvas = nvgEmp.getChildAt(i) as Canvas;
					
       canvas.createComponentsFromDescriptors(true);
	}
				
	trace("已初始化Tab页子控件。");