Silverlight: Tabbing in DataGrid

I have a DataGrid with four rows and a few columns.开发者_开发技巧 Only the last column has an item (a button) with IsTabStop=True.

If I press tab the button in the first row gets the focus. If I hit tab a second time the next control outside the grid gets the focus. If I then hit shift-tab the button in the last row gets the focus.

Is there a way to make the DataGrid work like other controls and just tab normally through the four buttons?

For the focus to remain within the DataGrid, the current cell needs to be in edit mode.

http://msdn.microsoft.com/en-us/library/cc838112(v=vs.95).aspx