Mantain graph on screen

[<mauricio0copo AT gmail.com>]

Hello,

I've been using the attribute "padding: 100px, 100px, 0px;" to mantain the
graph on screen, but every time I zoom in or out (using PgUp and PgDn) this
attribute is nullified and the graph often drifts away with auto layout turned
on.

Can anyone help me?
This also happens with the simplest graphs, so I don't think I need to post my
code here.