Override Print print overview functions - GoView


I want to explore & override "print" & "print overview" functionality supported by Go Diagram.
So can anybody plesae provide me some sort of example to help me out.

Samples Demo1, Flowcharter, Orgcharter, Planogrammer and ProtoApp all have printing and Print Preview.

(In Planogrammer, it is ^P and shift-^P)
Also info in the User Guide and FAQ doc.
and numerous entries in this forum.