def on_treeview_button_press_event(self,widget,event):
		#
		# if event.button==1 and event.type==Gdk.BUTTON_PRESS:
		#
		# Gdk.EventType.2BUTTON_PRESS is not working in python because
		# it starts with number so use Gdk.EventType(value = 5) to construct
		# 2BUTTON_PRESS event type
		if event.button == 1 and event.type == Gdk.EventType(value=5):		
				model,iter = self.treeview.get_selection().get_selected()
				id = model.get_value(iter,0)
				snd = TaskDialog(id)
				snd.run()
				snd.destroy()