Can the three elements in the Measure listbox in the attached have different colors. The reason for the question is that if I have many elements in the listbox for the user to select to show up in a chart or not, I would like to group these elements with a particular color with a group; and a second group will have a different color. The colors will only act as visual cues to the user to indicate grouping, and nothing more.
If this is not doable, what other mechanisms can I use? (I know that I can group the elements in different listboxes.)