Check to make sure a number has been picked in each box
<p>I just want to have a check to make sure the user picked a number in the 2x2. So if the user doesnt pick a number in one of the boxes then I want a messagebog to popup telling the user to fill in all boxes.</p>

<p><img src="http://i.stack.imgur.com/pK9wm.png" alt="alt text"></p>
