Hello Peter,
I do not believe there is any way to enable a color map indicator on this graph. There are ways to display intensity in a seperate graph, however. Another customer has addressed a very similar issue at this link: http://forums.ni.com/ni/board/message?board.id=170&message.id=34884&requireLogin=False , and has provided a pretty good example. One of the bigger things to watch for is the conversion between the ActiveX color scheme and the LabVIEW color screen.
I hope this has been of help,
Travis M
Applications Engineer
National Instruments
Travis M
LabVIEW R&D
National Instruments