Is it possible to set master row in edit mode (showing EditFormTemplate) and at the same time display detail rows (using ItemTemplate)? In my case detail rows were hidden when master was set in edit mode -after Edit button pressed on master row.
From what I understood the Expanded state of the nested Grid is lost while editing the master. If so you can refer the following code library submission which explains how to Retain expanded/selected state in hierarchy on rebind .