(glib:define-gboxed-opaque tree-row-reference "GtkTreeRowReference"
  :export t
  :type-initializer "gtk_tree_row_reference_get_type"
  :alloc (error "GtkTreeRowReference cannot be created from the Lisp side."))  

The gtk:tree-row-reference instance tracks model changes so that it always refers to the same row. A gtk:tree-path instance refers to a position, not a fixed row. The gtk:tree-row-reference structure is opaque, and has no user visible fields. Create a new gtk:tree-row-reference instance with the gtk:tree-row-reference-new function.