code: func Create(xu *xgbutil.XUtil, parent xproto.Window) (*Window, error) {
  	win, err := Generate(xu)
  	if err != nil {
  		return nil, err
  	}
  
  	err = win.CreateChecked(parent, 0, 0, 1, 1, 0)
  	if err != nil {
  		return nil, err
  	}
  
  	return win, nil
  }
docs: // Create is a convenience constructor that will generate a new window id (with
  // the Generate constructor) and make a bare-bones call to CreateChecked (with
  // geometry (0, 0) 1x1). An error can be generated from Generate or
  // CreateChecked.