[vtkusers] How to bind notes to a geometry ?

[Langhammer]

I'd like to bind user notes to my vtk geometries. Something like:
geometryA -> note: "This is a hotspot." geometryB -> note: "Please
redesign this part."

What is the correct way to do this? Deriving vtkCellArray? vtkPolyData,
or vtkActor ?
What i have to keep in mind that my notes become serializeable with the
vtk scene ?

thanks in advance,
Stefan