Remove Item from ComboBox

Just guessign here, but I think the ComboBoxColumn defiens only the headers.

You want to add a ComboBox to a specific Cell. Adding it to the whole Column makes no real sense.

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Let's talk about MVVM: http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/b1a8bf14-4acd-4d77-9df8-bdb95b02dbe2