ID:273073
 
Title. I'm using a custom interface and this is a bother to not be able to minimize. :/
Theres an option on the skin which allows you to choose whether or not your game can be minimized, or resized. Just make sure you tick the minimize box, and the minimize button will reappear.

If you can't find it, rightclick your main window, click edit, and its in the options tab.
In response to BrotherBear
I was thinking of a custom button to mimic minimize.
In response to Vic Rattlehead
Windows have an interface element called is-minimized. So essentially, if you set this value to true for any window it will be minimized. I recommend setting the command of a button you want to use to minimize a window to ' .winset "(windowname).is-minimized=true" '