I recently stumbled over a bug in the Silverlight 2.0 DataGrid.
If you try to edit a row in the DataGrid and change the ItemSource while in editing mode, you will see a blank line in the area of the edited row (like the first 'row' in the image below).
This also happens when the User has clicked e.g. a button or a CheckBox inside the DataGrid before you change the ItemsSource.
Do fix this issue, simply download a new version of the Silverlight DataGrid at the
Microsoft Download Site