Colored text in listbox or smth similar

Question

Hi
I'm working hard :) on my project and I'm trying to put some scripts on an interface. Also I want the sintax to be obvious, so I want it coloured. I succeeded to do only a part of this. I used a listbox and I have line by line coloured scripts. But if I want to colour it by words ?(for instance for comments , the code black, the comments green)
Is there a solution with listboxes? Or with something else?
Thanks