Hello!
I have been making progress with the extension.  Now you can open the
mgpviz file and the atoms will be displayed properly with their
corresponding bonds in #0.1, the nuclear atractors in #0.2 and the
bond critical bonds in #0.3  It works great!!

I am adding Helium atoms to represent the critical points:

atomNACP = mNACP.newAtom(atom1, Element("He")

and it works fine.
Is there a way to modify the color and size of each individual atom
while it is reading the input? Is it possible to modify the default
properties generated from the connectMolecule() ?  The idea is that it
displays the original molecule (extracted from the XYZ coordinates) in
wire representation, and the bond critical points in red (as an
example) and the other critical points in blue.  Each point group are
generated in their own separate molecule with different Molecule()
commands, so, is it possible to modify the visualization properties?