[vtkusers] a compiler error in VTK/KWWidgets app

[Dean Inglis]

I am developing an application that
uses vtkPointHandleRepresentation2D in the
representation of a vtkSeedWidget.  KWWidgets
is used as the GUI to display an image
in a render window.  During a lengthy callback
that does some image processing, I manually access
the main window's progress gauge to periodically
give user feedback.  If I #include the headers for vtkKWApplication
and vtkPointHandleRepresentation2D in the source file for the
application main window (not the application driver), 
I get the following error:

vtkPointHandleRepresentation2D.h(96) : error C2059: syntax error 'constant'
vtkPointHandleRepresentation2D.h(96) : error C2238: unexpected token(s)
preceding
';'
Nmake : fatal error U1077

etc. etc.

If I comment out the use of code requiring use of either one of those
headers,
the app compiles.  I am building vtk, kwwidgets in shared release mode on 32
bit Vista 
with Visual Studio 2005 and doing an nmake install to a common development
directory.  
Any ideas as to what is going on would be appreciated.

Dean