code: func (v *ToolButton) GetIconWidget() *Widget {
  	c := C.gtk_tool_button_get_icon_widget(v.native())
  	if c == nil {
  		return nil
  	}
  	return wrapWidget(glib.Take(unsafe.Pointer(c)))
  }
docs: // GetIconWidget is a wrapper around gtk_tool_button_get_icon_widget().