import dia

def daigram_from_data_cb (data, flags) :
	display = dia.active_display()
	if display and display.diagram.data == data :
		dia.message(2, "Got the diagram!")
		display.diagram.save (r"d:\temp\delme.dia")
	else :
		dia.message(0, "No diagram, only data!")

dia.register_action ("DiagramFromData", "DiagramFromData", 
                     "/DisplayMenu/Debug/DebugExtensionStart", 
                     daigram_from_data_cb)