Lock datagrid column width

In my datagrid, even when I set the width of some columns explicitly, they always change in an unpredictable way when I (1) resize my window (2) minimize and maximize the window. I finally find the cause: it’s because I used “minWidth” in a column I don’t want to lock. Here is the code which causes the problem. Removing minWidth will fix it.

<mx:DataGrid width="100%">
    <mx:DataGridColumn id="c1" width="50" />
    <mx:DataGridColumn id="c2" minWidth="150" /> <!-- remove minWidth -->
    <mx:DataGridColumn id="c3" width="60" />
</mx:DataGrid>

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