private void AddJobToTimeLine_Click(object sender, RoutedEventArgs e)
 {
     if (this.currenResource != null)
     {
         int duration = ((int)this.ToDurationMinuten.Value) * 60 + (int)this.ToDurationSekunden.Value;
         TimeLineItemVM tlivm = new TimeLineItemVM(duration, this.currenResource);
         ((TimeLineControl)this.TimeLineContainer.Children[(int)this.ToShowWindowId.Value - 1]).Add(tlivm);
         this.SelectIResource.SelectedIndex = -1;
         this.SelectedName.Text = string.Empty;
         this.currenResource = null;
     }
     else
     {
         MessageBox.Show("Bitte eine Resource auswählen!", "Info", MessageBoxButton.OK, MessageBoxImage.Information);
     }
 }
 public void Add(TimeLineItemVM tivm)
 {
     this.Items.Add(tivm);
 }