Selectable container widgets

[Paul Lange <palango gmx de>]

Hey,

As part of this years GSoC I plan to implement a widget  for layer
controlling in PiTiVi which will look like this Glade design:
https://wiki.pitivi.org/wiki/File:Glade-1.png

One important aspect is that this widget should be selectable and
dragable. Every Widget provides drag events, so I don't expect problems
from this side. What bothers me is selectability.
It should be possible to select the whole container (GtkTable) to make
it possible to add controls for removing and reodering of layers. This
selection should be indicated, most likely by a change of the background
color.

Do you have any hints, examples or information in on how to make
Container widgets selectable?

with best regards,
Paul