In current version of CUBRID Tools, there is no Window menu and no menu actions to maximize or minimize the window. Users need to manually click by a mouse pointed on - and + buttons on the left corner of the window.
It is pretty much standard on Mac OS X that most GUI based applications have Minimize and Zoom/Zoom Window menu items in Window menu item which allow developers to assign a keyboard shortcut system wide to those menu items to make it more convenient and fast to toggle between maximized and normal window.
Please create a Window menu item and add two actions to Window menu. It's very simple:
1. Minimize with a Cmd+M shotcut
2. Zoom Window (usually this menu has no shortcut, sometimes users assign Shift+Cmd+M to this menu)
Similar action can be added to Windows and Linux versions as well to provide more convenience to CUBRID Tools users.