code: func ToggleToolButtonNew() (*ToggleToolButton, error) {
  	c := C.gtk_toggle_tool_button_new()
  	if c == nil {
  		return nil, nilPtrErr
  	}
  	return wrapToggleToolButton(glib.Take(unsafe.Pointer(c))), nil
  }
docs: // ToggleToolButtonNew is a wrapper around gtk_toggle_tool_button_new().