Thanks to our support service provider I have manged to get the answers to this. I hope this will be useful to some , it was to us.
The script to make sure picture is in ISO and zoom-to-fit is :-
'Fit Isometric View
Set MyPart = swApp.ActiveDoc
boolstatus = MyPart.SetUserPreferenceToggle(swUserPreferenceToggle_e.swDisplayPlanes, False)
MyPart.ShowNamedView2 "*Isometric", 7
MyPart.ViewDisplayHiddenremoved ( remove this line if you want it shaded)
and should be past into advance scripting option window here:-