I have a grid like this:

Head1 Head2 Head3
A         B       X
A         B       Y
A         C       X
A         C       Y

Is there a way to tell xamDataGrid to hide the repeated cells so I get something like this:

Head1 Head2 Head3
A         B       X
                    Y
           C       X
                    Y

Thanks,
Mike

P.S. For bonus points, I also need to enable the same sort of thing in Silverlight with the XamGrid.