在DataGrid中使用MultiSelectComboBox作为单元格并设置Star类型的宽度，当DataGrid中存在两行及以上时，添加列后执行ItemsSource.Clear时报System.NullReferenceException错误。 System.NullReferenceException HResult=0x80004003 Message=Object reference ...
Just be aware that there is a RequestBringIntoView Event on the TreeView and a RequestBringIntoView Event on the TreeViewItem. Using a VirtualizingPanel for my implementation causes all sorts problems ...
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