Subclassing with less crashing?

Hey,

I am using subclassing in my program since recently to make two windows move together (stick them together).

Now because of the subclassing my IDE keeps crashing... I knew this would happen, but I read that it would only happen when pressing the Stop button or using an "End" statement to stop the program.

However, it is happening a LOT more frequently here! The weird thing is that pressing the Stop button seems to be the ONLY safe way to end the program without crashing the IDE!
If I close the program manually via the usual way (press X button) it crashes... ALL THE TIME.
If I close the program using the IDE's Stop button, it doesn't crash all the time, only very occasionally (acceptable).

Even when running the program (pressing the Play button or "Run with full compile" it crashes very often...

I just can't develop my program anymore with all these random crashes... If it was just when pressing the Stop button it wouldn't matter that much, I would simply not use the stop button... But the crashes seem very random here, happening on all sorts of occasions... and it's just very annoying.

Is there anything, at all, you can do about this?
I found this thread on another forum about IDE Safe subclassing, downloaded the attachment but have NO IDEA how to use it... it is explained but I just don't understand all the words etc... I don't know anything about subclassing lol...
http://www.xtremevbtalk.com/showthread.php?t=285517

Any idea's?