HT1338: OS X: Updating OS X and Mac App Store appsLearn about OS X: Updating OS X and Mac App Store apps
Currently Being ModeratedApr 25, 2013 2:02 PM (in response to casiodoro)
Choose Computer from the Finder's Go menu, double-click the internal drive, and drag it back from there.
Currently Being ModeratedApr 25, 2013 2:03 PM (in response to casiodoro)
I see that you have just lost it from the Dock, not from Mac OS X. To recover it, open a Finder window and drag Applications from the Finder sidebar to the right part of the Dock, so it will appear there. If, after restarting, it disappears again, you may consider a problem with your Dock settings file