Cannot add GtkBox or other widgets inside a GtkPopoverMenu
I want to populate a GtkPopoverMenu using Glade.
Most of the GtkPopoverMenu examples I have found online use a GtkBox inside GtkPopoverMenu, and some GtkMenuButtons inside the GtkBox. This examples are in XML format.
I'm trying to use Glade to do the same thing, as it is more convenient than editing XML files manually.
But Glade won't let me add a GtkBox nor any other widget inside the GtkPopoverMenu. Every time I try to drop some widget inside the PopoverMenu, it shows a Diaglo Box saying:
Los widgets de tipo Menú emergente necesitan un lugar disponible para añadir hijos.
Which translates to something like:
Pop-up widgets require an available place to add children.
And won't add the GtkBox or other widget inside the GtkPopoverMenu
I can manually edit the XML file to add the GtkBox using a text editor, and it works ok once I open it on Glade, and it let's me edit any of the children of the GtkPopoverMenu. It's just that Glade wont let me add anything inside the GtkPopoverMenu in the frist place.