Flex AdvancedDataGrid 数据展示异常

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原因分析如下:

1:

If you set the dataProvider property and then immediately call
 the expandChildrenOf() method, you may not see the correct behavior. 
 You should either wait for the component to validate,
 or call the validateNow() method before calling expandChildrenOf().

 

2:调用 expandItem 展开 子条目 ,判断 父条目是否已经展开。

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