Zoom Keyboard Shortcut Doesn't Work

I tried setting a shortcut for "All Applications" -> "Zoom" so that I can have a keyboard shorcut for the green button/maximize button at the top (you can probably tell I just switched over from Windows). I set it to control+Z (^Z) and in FireFox when I look at the Window menu at the top I see "Zoom ^Z" like it should work, but it doesn't. When I click control+Z the Window menu at top sort of flashes/highlights real quick but the zoom function is not called. When I manually go to Window-->Zoom, it works.

Can anyone please help me set up this keyboard shortcut?

Thanks so much.

- dshap

 

does no one have a zoom keyboard shortcut?