54) Can I have items with different colours in a list?

Answer: No.  The list contains XmStrings, and these only allow text in various
character sets. Since the items are XmStrings, you can already change the font
of an item by replacing it with an item with the same text and a different
charset tag.  Adding support for color would require modification of the
internal data structure in XmList as well as modification to the drawing
routines.  A possible workaround is to use a rowcolumn of buttons which can be
individually set.  However, you would have to do all list functionality
yourself.