[mapserver-users] Thematic Legend, Name / Label?

[Hankley, Chip]

I have an application that has two thematic layers (plant communities). I
want my legend to look something like this (when both layers are on):

Historic Vegetation
  cattail
  marsh
  willows
Current Vegetation
  grass
  trees
  weeds

I can get the thematic legend to draw, however, there is no "first order
grouping"... i.e. all I can get to print in my legend is:

  cattail
  marsh
  willows
  grass
  trees
  weeds

Is it possible to specify a heading in the legend for a particular theme?

Thanks!

Chip Hankley