private void Start()
{
_currentIndex = 0;
if (_currentElement != null)
_currentElement.DataContext = GetCurrent();
if (_nextElement != null)
_nextElement.DataContext = GetNext();
if (_timer == null)
{
_timer = new DispatcherTimer() { Interval = TimeSpan.FromSeconds(1) };
_timer.Tick += timer_Tick;
_timer.Interval = TimeSpan.FromSeconds(_randomizer.Next(5) + 5);
}
_timer.Start();
}