[GtkGLExt] Using gtkglextmm widgets and libglademm

[Miguel Angel Polo <miguel polo telefonica net>]

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Hi all

I want to know the correct way to load a widget (derived from
Gtk::GL::DrawingArea) from my .glade file

I have a class like this:

class MySceneClass : public Gtk::GL::DrawingArea
{
~  ...
};

(and Gtk::GL::DrawingArea derives from Gtk::DrawingArea)

But Glade (the interface designer) doesn't have any Gtk::GL::DrawingArea.

So, I think (me noob) I must use Gtk::DrawingArea in .glade file, and
then load it using Gnome::Glade::Xml::get_widget_derived to get a
MySceneClass*.

I'm gonna try this but I want to know if is there any better approach on
doing this.
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