[VB 2012] ListView Selection Color ändern

public class ListViewSimpleAdorner : Adorner
{
  public SolidColorBrush backgroundBrush { get; set; }
  public SolidColorBrush penBrush { get; set; }
  public Pen drawingPen { get; set; }

  public Rect HighlightArea
  {
    get { return (Rect)GetValue(HighlightAreaProperty); }
    set { SetValue(HighlightAreaProperty, value); }
  }

public static readonly DependencyProperty HighlightAreaProperty =
   DependencyProperty.Register("HighlightArea", typeof(Rect), 
   typeof(ListViewSimpleAdorner), new FrameworkPropertyMetadata(new Rect(), 
   FrameworkPropertyMetadataOptions.AffectsRender));

  public ListViewSimpleAdorner(UIElement element)
    : base (element)
  {
    backgroundBrush = new SolidColorBrush(Colors.LightBlue);
    backgroundBrush.Opacity = 0.5;
    penBrush = new SolidColorBrush(Colors.Black);
    penBrush.Opacity = 0.5;
    drawingPen = new Pen(penBrush, 1);
    this.IsHitTestVisible = false;
  }

  protected override void OnRender(DrawingContext dc)
  {
    dc.DrawRectangle(backgroundBrush, drawingPen, HighlightArea);
  }
}


// in der main class
ListViewSimpleAdorner myAdorner { get; set; }
Point? myDragStartPoint { get; set; }

// im main window's constructor:
this.SourceInitialized += delegate
{
  AdornerLayer.GetAdornerLayer(myListView).Add(myAdorner =
  new ListViewSimpleAdorner(myListView));

  myListView.PreviewMouseDown += (o, e) =>
  {
    if (e.ChangedButton == MouseButton.Left)
    {
      myDragStartPoint = e.GetPosition(myListView); 
      myListView.SelectedItems.Clear();
    }
  };

  myListView.MouseMove += (o, e) =>
  {
    if (myDragStartPoint.HasValue)
    {
      Rect r = new Rect(myDragStartPoint.Value, 
      e.GetPosition(myListView) - myDragStartPoint.Value);
      myAdorner.HighlightArea = r;
      var items = myListView.GetItemAt<CardItem>(r);
      if (items.Count > 0)
      {
        myListView.SelectedItems.Clear();
        foreach (var i in items)
          myListView.SelectedItems.Add(i);
      }
      else
        myListView.SelectedItems.Clear();
      }
    };

  myListView.MouseUp += (o, e) =>
  {
    if (e.ChangedButton == MouseButton.Left)
    {
      myDragStartPoint = null;
      myAdorner.HighlightArea = new Rect();
    }
  };

  myListView.MouseLeave += (o, e) =>
  {
    myDragStartPoint = null;
    myAdorner.HighlightArea = new Rect();
  };