Glade 'Parentless' Widget

Glade 'Parentless' Widget

Is there a way to create 'parentless' widgets in Glade? What I mean is,
for example, a table with no associated parent, so that I can assign it as
a child of something else later.
What I'm trying to do is a GTK window with a 3 positions VBox, 2 of which
will be static and 1 which will be dynamic. In this dynamic position I
want to load a pre-defined table which will vary according to whatever I
did in the static parts, like pressing X or Y buttons.
Is this possible, or do I have to create the dynamic table by code?
I'm using Ruby 1.9.3, Gtk2, and Glade3. Thanks.