Removing event handlers from objects during undo

[nshupeFMPE3]

I have a command where I add xdata and event handlers to a selected polyline. But when I undo that command, the objects still react to the event handlers. 

Why aren't the event handlers being removed during the undo?

[nshupeFMPE3 · Accepted solution]

I think I have solved my problem. During the undo the event handlers fire, I check to see if the object is open for undo. If it is I just exit the event handler. Then later in the event handler method I check if the object should still have the event handlers, in my case whether the object has xdata that I want, if it does not, then it should not have the event handler and the handler is removed. I was trying to remove it while it was open for undo, but I think it had to be removed later when it wasn't open for undo