Append to a tui.Box invalid

[foolishway]

This is my code:

history.Append(tui.NewHBox(
		tui.NewLabel(time.Now().Format("15:04")),
		tui.NewPadder(1, 0, tui.NewLabel(fmt.Sprintf("<%s>", "john"))),
		tui.NewLabel(message),
		tui.NewSpacer(),
	))

In fact I am trying the "chat" example, and read data from a TCP connection, then write to the "history", but it not works.