maemomm: virtual function overrides

[John Steele Scott <toojays toojays net>]

I have a Gtkmm application which uses a custom widget derived from 
Gtk::DrawingArea. This widget overrides the virtual functions of the 
parent, such as e.g.:

void PlotCanvas::on_realize()
{
  Gtk::DrawingArea::on_realize();

  // do some other stuff . . .
}

This works fine on my Ubuntu Gutsy machine, but when I try to compile 
this in the Maemo sandbox, it fails because there is no 
Gtk::DrawingArea::on_realize(). Similarly, other such signal handlers are 
never called, it seems that they need to be explicitly connected via 
their signal proxies.

Since I'm new to Gtkmm, I'd like to know: is this difference due to the 
version of Gtkmm in Ubuntu Gutsy being much newer than the version in 
Maemo Bora, or is it a core difference between the Hildon and vanilla 
versions of Gtkmm? (I imagine it might be the latter, to save code size.)

If the difference is due to the version number of Gtkmm, in which version 
did this feature (virtual functions for signals) get included in Gtkmm? 
Does the Maemo Chinook version of Gtkmm have overridable virtual 
functions?

cheers,

John