Making a Window Full Screen

Hello,
I am trying to make a window go full screen. Here is my code:

Code:

[window setFrame:[[NSScreen mainScreen]visibleFrame]display:YES animate:YES];
	SetSystemUIMode(kUIModeAllHidden, kUIOptionAutoShowMenuBar);

This makes the window fit the screen but I can still move the window around. Does anyone know what I am doing wrong.