Scoreboard doesn't show.

Hello, Developers!
Today I tried to make a Scoreboard on PlayerJoinEvent, but it doesn't work.

Code (Text):

public void gameListScoreboard(PlayerJoinEvent event) {
ScoreboardManager manager = Bukkit.getScoreboardManager();
Scoreboard gamelist = manager.getNewScoreboard();
Objective list = gamelist.registerNewObjective("gamelist", "dummy");
list.setDisplaySlot(DisplaySlot.SIDEBAR);
list.setDisplayName("Servers");
event.getPlayer().setScoreboard(gamelist);
}

Does someone know why it doesn't display? It doesn't give error in console or anything.

 

Yes, 1.8.3 R2

 

And how would I do, can you give me an example please?

 

I understand how Scheduler Progamming works but I don't understand your solution.

 

Ah, so you mean when I join the server I have to add a 3 ticks delay to the register scoreboard function (in the code)