Hi Randy,

Not directly.  One possibility is to use Pmw.ScrolledFrame (http://pmw.sourceforge.net/doc/ScrolledFrame.html) as the parent widget for the contents of your dialog.  Take the frame you get as an arg to the fillInUI() method and immediately create a Pmw.ScrolledFrame with that frame as the parent.  Then fill your dialog in from the frame you get from Pmw.ScrolledFrame.interior().  You can do this almost painlessly like so:

def fillInUI(self, parent):

sf = Pmw.ScrolledFrame(parent)

sf.grid(sticky="nsew")

origParent, parent = parent, sf.interior()

# remainder of fillInUI() remains the same...

Another possibility is to use the Feature_Buttons_Panel widget from Chimera's CGLtk.Hybrid module.  This is what Volume Viewer uses to hide/show sections of its interface.  You'd have to look at the Volume Viewer code to see how it's called since I haven't used it myself.

--Eric