I found a quick hack, streching the 'l', or similar to a rectangle works as color selection. The text can be colorized with [99ff00]l[-]. The UIPopupList should somehow manage UIPanels instead of just a text. That would be a much more valuable component, so we could decide what we put on the panel.
I'm making a strategy game, game creation panel where at least an icon (because it is a game, not an application for office) and text is needed. I need a popop menu at selecting the AI/Human, at selecting the race, the group and the color.