code: func (v *Stack) AddTitled(child IWidget, name, title string) {
  	cName := C.CString(name)
  	defer C.free(unsafe.Pointer(cName))
  	cTitle := C.CString(title)
  	defer C.free(unsafe.Pointer(cTitle))
  	C.gtk_stack_add_titled(v.native(), child.toWidget(), (*C.gchar)(cName),
  		(*C.gchar)(cTitle))
  }
docs: // AddTitled is a wrapper around gtk_stack_add_titled().