I write big application which will have to run 24/7, without turning it on and off. It has many dialogs, popups and stuff (it is application to manage production). My problem is that i have noticed after dialog pops up and someone close it, memory doesn't return to state before event occured. I mean, if application used 14000 KB of memory before dialog, it pops up, close and application uses 14100KB (even if dialog doesn't store any data). I read that all widgets used in my widget have to have parent set, so when my widget is deleting, all child widgets will be also deleted, but i have done this condition. How can i be sure that i release all memory?