--When the button is pushed, it makes something appear. This is tricky, because you need to
--actually make the thing that is to appear first. This is the general idea:
--Game starts, saves the object for later spawning, removes the object from the game, and waits
--for the button to be pushed to insert a clone of the saved object (if money check is ok). Study the code AND the objects 
--in the game to understand how this works. If the object that should be spawned is missing, you need 
--to make it first, because you probably saved this place after it was removed at the very beginning of the map.
--If this is the case, then make whatever, and put it in a group called "MoneyUpgradeModel"