How to know have we opened child dialogs

[Tyushkov Nikolay]

Is there a way to determine has my window opened child dialogs?  

i.e. Main application window can open some child dialogs in response to 
user's action: select color, file to open, folder to save, options 
window etc. But this moment user can hide application (it supports 
system-wide hotkey) or try to close it from tray menu. In this case 
there is problem with services dialogs, application should hide or close 
them too or ignore hide\exit command. But I have no idea how to know are 
there such windows or not. What I can do?

-- 
Best regards, Nikolay Tyushkov
http://softvoile.com - Work with texts faster!