Close window without ask dialog "want to save..."

[Josep M Yepes]

Hi,

How to do to close a child window from a main stack without receiving  
the ask dialog "Do want to save the changes?"

I have a main stack that show other substacks that insert data into  
one database. Every time that I show the others stacks when this are  
closed the ask dialog appear.

I looking over the forums but I can't find any... :(  maybe it's a  
dummy question but I don't know how to do..

Cheers,
Josep  M