Bill,

>It would be perfect if the projecthook had an AfterModifyFile() method, but it doesn't, only a QueryModifyFile() that executes BEFORE the file is modified.

I'm not sure I full understand what you are trying to do here, but what about using the QMF() event to create a timer, that fires say once every 5 seconds, when it does it looks to see if the designer window is still open, if the window is open the timer just does nothing and will fire again at the next interval. If the designer window is gone then you can call the code to go do the stuff to rebuild the class.