Colorful buttons of different shapes

Hi,I am porting my Win32 application to Mac. I am new to Cocoa. In my Windows Win32 application I have a window in that there is a 3 X 8 matrix of 24 buttons. Buttons are labeled as 124. Each button has 3 states.Unused  Round shape green color (Default state)Selected  Square shape orange color (User selects a button)Used  Round Shape red color (User save the selection by clicking Save button)In Win32 application I use owner drawn buttons to draw button of different color and shape.I'd be glad if someone could suggest me which control should i use in Cocoa to achieve the same effect. Should I use NSMatrix of buttons? If yes than how can i set color and shape of buttons?Thanks & RegardsAbhijeetDear macosxdev ! Get Yourself a cool, short @in.com Email ID now!