[examples] Override do_pick method in CustomContainer
[examples] Override do_pick method in CustomContainer

Some people on IRC complained about not receiving events from the
container's children. By overriding the do_pick method the
CustomContainer behaves as expected.

GNOME/pyclutter,GNOME/pyclutter,pmarti/pyclutter,pmarti/pyclutter,pmarti/pyclutter,pmarti/pyclutter