calendar tab colors

[EyeB]

not sure if I'm descriptive, but I've been looking to do this for a while, just thought to ask since I ran out of links in google :S

anyways, I'd like to keep using the calendar tab in WM 6.1. When I make an appointment it shows me a little triangle on that day. Is it possible to change that triangle color according to how I categorize the appointment? (IE gray for business, green for personal, etc)