Hello Raj,

Your PDUser class should have a SelectedClinicID property which will represent which clinic is currently selected.  Then in your EditorStyle for the XamComboEditor you can set the ValuePath property to ClinicID and bind the Value property to "DataItem.SelectedClinicID".  Take a look at the attached sample.  From here, you just need to set the SelectedClinicID to whatever you want and it will update the XamComboEditor.