When you have two of the same records in your data providor (i.e. the same object twice in an array) then the datagrid only allow you to select one of them, see the example below - you can only select the last "Moo".When you have two of the same records in your d
阅读背景：
当flex datagrid中有两个“相同”对象时，只能选择其中一个
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