ActionScript 3.0 :: Grid Planner : Change Color On Click?

Im making a tool to plan dungeons, its a 25x25 grid made up of movieclips, the movieclip used has 10 layers, each layer a different colour/pattern to represent a room type. The idea is to choose the room from the legend then click on the movie clips you want to turn them into that room type.i have tried 2 methods, 1st i generated a grid and added a "cell"+count to each new instance as made, however i can only get it to change the last cell, no matter which clip is clicked.Now the 2nd "noob" method is to make each cell(instance square on the grid) and label them by hand, as well as add the code for each cell, but clearly this is alot of work. But it works, the next steps would be To convert the current grid setup into a text string to save Add a counter so you know how many squares you have used Reset button.