Context Menu

Right i will try to explain this the best that i can. I am developing a sudoku program and i have 9 x 9 grid made out of labels i want to allow the user to be able to right click on the label and have a context menu come up with the possible numbers. The possible numbers is not a problem the problem is creating a dynamic event to allow me to populate the label that i clicked on with the chosen number that the user has selected from the context menu if someone could help or offer and alternet way of doing this i would much appreciate it