如果使用了VirtualStackPanel，则在WPF DataGrid中出现异常

I'm using C# with .Net 4.0 and WPF DataGrid. Sometimes I have the following exception during program execution. The exception will be thrown if I change the value of some columns. Virtualization for DataGrid is activated (but only for rows, column virtualization is set to false). Now I need to know if it's a bug inside .Net.I'm using C# with .Net 4.0 and WPF DataGrid. So