Latest programming project - remake of Collapse

I rather liked the original online game, so I decided that, for my latest programming endeavour, I would re-implement it in XNA. I think I have the "grid" drawn correctly; now I need to get the scoreboard drawn. After that I can focus on the game logic. In theory, it's quite simple: click a block and check if it is part of a chain of 3 or more. *sigh* Logic is not one of my strong points.