function __construct()
{
$this->dataFile = "chart";
parent::__construct();
$this->bps = BPS::getAllProperties("StatistikControllingGUI");
$D1 = new Datum(time());
$D1->setToJan1st(date("Y"));
$D2 = new Datum(time());
$D2->setToJan1st(date("Y") + 1);
$D2->subDay();
$this->startDatum = isset($this->bps["start"]) ? $this->bps["start"] : Util::CLFormatDate($D1->time());
$this->endDatum = isset($this->bps["ende"]) ? $this->bps["ende"] : Util::CLFormatDate($D2->time());
$this->mK = null;
}