[vtkusers] Probing points

[Hamilton Woods]

I am reading a PLOT3D solution (.xyz and .q files) that 
has 2 blocks.  When I probe points using VTK, the scalar 
tuples are available for the data in the first block, 
but not in the second block.

Can a probe be made of points in multiblock data?

If so, how does one obtain the tuples for data in each 
of the blocks?

If not, is there a VTK function to convert multiblock 
data to a single block?

Thanks,
Hamilton Woods