[Closed] force unRegisterRedrawViewsCallback ?

Hello all

Well I just learn a few on registerRedrawViewsCallback / unRegisterRedrawViewsCallback.
It’s really cool !
But I have a little pb

I explain :
If I restart MAX then evaluate this script :

 fn func1 = 
(
	 print "redraw1" 
)
registerRedrawViewsCallback func1
unRegisterRedrawViewsCallback func1

Nothing happen… and it’s logic, because I register then unregister

Well, now if i evaluate this script :

 fn func1 = 
(
	 print "redraw1" 
)
registerRedrawViewsCallback func1
--unRegisterRedrawViewsCallback func1

Something happen (print “redraw1”) when the viewport need refresh, because I register…

But now, if I re-evaluate the first script or simply the script :

unRegisterRedrawViewsCallback func1

The redraw callback is always execute.
So, how disable it completly ?
And if itsn’t possible, how to prevent this, with a boolean value like isRedraw = true ?

Thanks