[ns] When and Where will change an Event's uid??

[Liuhai]

hi all

	When i simulate, i some times get such an error "Event UID not valid", so I want to know when and where an event's uid is changed
	by the way, my Event is Timer event

	

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¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡Liuhai
¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡bjliuhai@163.com
¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡2004-01-03