Mac OS X: I accidentally clicked on the cross in the Installed tab in the app store application. Now my Pages doesn't work anymore I did this with pages because I thought that it would uninstalled it (I'm brand new to mac os). It didn't uninstalled it, but it did remove it from the list of installed applications.

Now when I visit the Pages page in the app store, it shows that I must purchase it again. What did I do? How can I get Pages back? I bought it already and all I want to do is fix the installation. It doesn't work at all at the moment.
So the cross in the list of installed applications actually just hides the app but does not uninstall it. When you open the app store go to Account -> Hidden purchases. It will be there.