Every time I launch dota 2 on my pc running 13.10 it looks like this:

The side and top bars don't go away even though the game is in full-screen. I only have this problem with dota 2 all other games work fine in full-screen.
I have tried going into the settings and enabling the shortcut that forces fullscreen mode but nothing happens when I press the shortcut. is there a way to fix this or force ubuntu into fullscreen mode?

This problem is only with Dota 2 and not other fullscreen apps/games.