Rich text box & colors

I have a problem with rich text box and it's colors.

I am doing a html- editor and i want to work it so that when the user writes a command <br> for example, then it should change color and when user keeps writing the text comes black again. So every command should have own color and only commands have colors.

Of course different commands must have different colors.

So how to do that??

Have a look at VolteFace's code colorizer in the Code Library. It does exactly that.