Drawing using DrawingContext over elements on canvas

Question

I'm drawing a selection box when I click and drag on my canvas object (which extends Canvas). I have overridden the OnRender method like so:

 protected override void OnRender(DrawingContext dc)
 {
  base.OnRender(dc);

  DrawGrid(dc);
  DrawSelector(dc);
 }

 private void DrawSelector(DrawingContext dc)
 {
  if (Selecting)
  {
   dc.DrawRectangle(new SolidColorBrush(Color.FromArgb(75, 0, 0, 255)), new Pen(Brushes.Blue, 1.5), SelectionRect);
  }
 }

But my selector is always drawn UNDER all the elements on the canvas. Does anyone know how I would draw my selector OVER all the UIElements on my canvas?

Thanks.

Answer 1

You can use an Adorner for this purpose.

HTH, Kent