[vtkusers] Avoid highlighting of picked vertices in a graph

[Steffen Oeltze]

Dear VTK users,

I am using a VTKGraphLayoutView to display a graph. The user may select 
individual vertices and other linked views shall be updated accordingly. 
Now, I would like to offer different kinds of selections, e.g., "Include 
this vertex", "Do not include this vertex",..., and colorize the vertex 
according to the selection type. I set up a point lookup table and 
change its values accordingly. Although this works in principle, the 
color of a currently selected vertex gets overwritten (on the screen) by 
the picking/highlighting color. Is there a way to avoid this?

Best Regards,
Steffen