Graphical Tree Creation Tools for BCB

Does anyone out there know of any graph layout tools that are native to
VCL?  I have been looking at the Graph Editor Toolkit from Tom Sawyer
Software.  It seems to have everything I need, but it is written for
OWL.  Are there other packages out there?  If not, how much of a pain is
it to integrate OWL into VCL?  How can I get more info?

Thanks in advance...
Lisa Mitchell
CPT International