pocketmine\gui\frmMain::onMenulbPlayers PHP Method

    function onMenulbPlayers($event)
    {
        if (stripos($this->lbPlayers->GetString($this->lbPlayers->GetSelection()), "@") !== false) {
            $this->menulbPlayersOp->SetText("Deop");
        } else {
            $this->menulbPlayersOp->SetText("Op");
        }
        $this->lbPlayers->PopupMenu($this->menulbPlayers, $event->GetPosition());
    }