def OnCancel(self, evt):
	    self.parent.SetPanel(None)
returns True if the node value can be updated incrementally as time is updated
dataset/ETHPy150Open jyr/opentumblr/opentumblr/link.py/Link.OnCancel--crossover with--dataset/ETHPy150Open manahl/mdf/mdf/nodes.py/MDFNode.has_timestep_update