public static Button createPostbackButton(String title, String payload) {
		return new PostbackButton(title, ButtonType.POSTBACK, payload);
	}
public static Button createPostbackButton ( String title , String payload ) { return new PostbackButton ( title , ButtonType . POSTBACK , payload ) ; }
Creates a button which sends a payload back when clicked.

@param title
the button label.
@param payload
the payload to send back when clicked.
@return a {@link PostbackButton}.