获取Flex中的itemRenderer中的控件

					
					lstFielsInput.validateNow();//必要时刷新
					var numItem:int=lstFielsInput.dataGroup.numElements;
					for(var i:int=0;i<numItem;i++){
						var itemRenderer:ItemRenderer=lstFielsInput.dataGroup.getElementAt(i) as ItemRenderer;
						if (itemRenderer){
							itemRenderer.validateNow();
							var hg:HGroup=itemRenderer.getElementAt(0) as HGroup;
							var textInput:spark.components.TextInput=hg.getElementAt(1) as spark.components.TextInput;
							textInput.text="";
						}
					}

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