Nick,

The treeview returns an object reference when you add a node:

loNode = o.add(ALLTRIM(cparent),4,ALLTRIM(ckey), ALLTRIM(dspval),0)

** So just set the properties on the returned object.
loNode.forecolor=255
loNode.backcolor=16777215
loNode.bold = .t.

So you can set each node's properties individually...