code: func ToolItemNew() (*ToolItem, error) {
  	c := C.gtk_tool_item_new()
  	if c == nil {
  		return nil, nilPtrErr
  	}
  	return wrapToolItem(glib.Take(unsafe.Pointer(c))), nil
  }
docs: // ToolItemNew is a wrapper around gtk_tool_item_new().