How do I make my program enter full screen? GUI, GCF, hObject, varargin.

How do i make my window fullscreen without the task bar or managers. Legit fullscreen so that you can not access any components of the computer unless pressing command+Q and closing the window. I have to run my program so participants can only focus on what is infornt of them and not the task bar. I have attatched images of my code, and what it currently looks like.

[Rik]

This requires some non-standard code. You could check if the psych toolbox has something to do this. (the psych toolbox is a third party package with a lot of functions with varying code quality)