WPF supports an Undo stack for every text box. But to support a global undo stack for the entire XamDataGrid requires implementing your own undo stack. If you do an internet search for WPF Undo, you will find solutions other users have come up with for supporting undo/redo for a WPF application. A WPF solution would more than likely work with the XamDataGrid since this is a WPF element.

You can also submit a feature request at the following webpage:
http://devcenter.infragistics.com/Protected/RequestFeature.aspx

Thank you!