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| GladePlaceholderGladePlaceholder — A GtkWidget to fill empty places. | 
GladePlaceholder implements AtkImplementorIface, GtkBuildable, GtkScrollable and _GladeDrag.
Generally in Glade, container widgets are implemented with GladePlaceholder 
children to allow users to 'click' and add thier widgets to a container. 
It is the responsability of the plugin writer to create placeholders for 
container widgets where appropriate; usually in GladePostCreateFunc 
when the GladeCreateReason is GLADE_CREATE_USER.
GladeWidget *
glade_placeholder_get_parent (GladePlaceholder *placeholder);