gtk/gtk.go
func (v *Paned) Add2(child IWidget) {
	C.gtk_paned_add2(v.native(), child.toWidget())
}
func (v *Paned) Add2(child IWidget) {
	C.gtk_paned_add2(v.native(), child.toWidget())
}
// Add2() is a wrapper around gtk_paned_add2().