Problem deriving GLArea widget

I am trying to derive a widget off of Gtk::GLArea,
when I do, I get GLib-GObject-CRITICAL **: g_value_take_object: assertion 'G_IS_OBJECT (v_object)' failed
and "OpenGL context creation failed.

I have tracked this to
GdkGLContext* GLArea_Class::create_context_callback(GtkGLArea* self)

where a different path is taken whether or not the GtkGLArea self is derived or not. However, I don't know if I am not doing something correctly, or if this is a bug.

Any help would be apprectiate.

the following example demonstrates the problem under a ubuntu 16.04.


Description: Text Data

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