gboolean gtk_popover_menu_add_child ( GtkPopoverMenu* popover, GtkWidget* child, const char* id )
Adds a custom widget to a generated menu.
For this to work, the menu model of
popover must have
an item with a
custom attribute that matches
The data is owned by the caller of the function.
The ID to insert
The data is owned by the caller of the function. The value is a NUL terminated UTF-8 string.