I have a XamDataPresenter on a tab which has it's DataSource set to a DataTable.DefaultView.  The DataTable is set when the user selects the tab that the grid is on.  The DataTable is also set when when a button on that tab is clicked (to update the data) - that works.  However, when a different tab is selected and then the tab with the grid is selected again, the grid has extra empty record and the scrolling is out of whack...  Is there a different way that I should be updating the DataSource? 

When the DataTable is updated I set DataSource to null then reassign DataSource to DataTable.DefaultView.  Just reassigning the DataTable did not work in either cases mentioned above.

Thank you,
Mike