I have started to customize all GUIs from the default game but I cannot find the quit GUI (Are you sure you want to quit...). Where the hell is it?
If you want to make your own custom quit GUI so that you can edit parts of it, create one and use it- the quit button of such a selfmade GUI would then call QuitGame(0) in order to quit the game without using the build in "quit the game (yes/no)" message.
I use this myself from a Quit button which brings up the Do you want to quit gui which iv'e customised.
See also:
http://www.adventuregamestudio.co.uk/yabb/index.php?topic=38466.0 (http://www.adventuregamestudio.co.uk/yabb/index.php?topic=38466.0)
In fact, most of the pop-up dialog GUIs like that with the same bland grey look to them are hard-coded, built-in interfaces that you can't change at all, just as a fallback for people who don't want to make one themselves. :P
As barefoot said, just create your own GUI. Then, you'll have to add some script yourself:
// global script
// on_key_press
// ...
else if (keycode == eCtrlQ) gQuit.Visible = true; // turn on Quit GUI
// btnQuitYes_Click - this function should be created for you by the Events pane
QuitGame(0);
// btnQuitNo_Click
gQuit.Visible = false;
Thanks a lot - I'm gonna make it so.