void t_Tick(object sender, EventArgs e)
{
_mandelBrot.NextLine();
this.ContentPanel.Background = new ImageBrush()
{
ImageSource = _mandelBrot.Source
};
_dispatcherTimer.Interval = _mandelBrot.IsComplete
? TimeSpan.FromSeconds(2.0)
: TimeSpan.FromMilliseconds(1.0);
}
