inspect multiple objects as one by script

[Mathieu Leclaire]

When I select multiple objects that contains the same custom parameters 
and I click on selection on the right tab and open the ppg of one of 
them and change a value, that value gets changed for all selected 
objects... I want my script to select multiple objects and launch the 
ppg with the same logic, i.e. have one parameter that will change all 
the values of the selection. I can't figure out how to inspect that ppg 
in that specific way. It always opens a list of the various objects 
parameters instead of just opening one that will affect all selection. 
What do I need to do in my script to make it inspect all as one like it 
does when I use the right tab selection menu.

-Mathieu