removing ask/answer/msg substacks from old mc stacks

[Jeff Reynolds]

I'm sorry i have done this in the past, but have forgotten how to do it.

I have some old mc stacks from like 8 years ago that have the ask and  
answer dialog substacks in them. i removed them in rev 2.6.1, but now  
i keep getting a message box error (message box is already open in  
rev) when i open the stack in rev 2.8.1. so it seems that there is  
still a message box substack hiding in my stack, but it doesnt show up  
in application browser with my stack. i remember a similar problem in  
the past with old mc cards like this, but ive forgotten what i did  
last time to loose all the old substack assets to make it clean with  
rev.

thanks

jeff reynolds