Howto : new widget & new container

[Stephane Wirtel <stephane wirtel belgacom net>]

Hi all, 

I want to create a new widget with a new container. Theses news objects
are to draw a P.E.R.T. diagram.

With the example from the tutorial, how to implement the
on_button_press_event signal ? Is there an example or a small
documentation ?

Thanks, 

Stephane