Listbox: Add items in different colors

Hi,
I got a working way of adding items to a listbox, but i would really love to add pieces of text in different colors.
Say, one button adds ‘[COLOR=Blue]you clicked the blue button[/COLOR]’, and the other adds ‘[COLOR=Red]you clicked the red button[/COLOR]’.

Is this possible?

My current code:
[COLOR=DimGray]on(release){
history.addItemAt(0, “boring black text”);
}
[/COLOR]