private void CreateIndicatorRect(CanvasControl canvasControl)
{
if (canvasObject != null)
{
canvasObject.Remove();
}
// visualize it
var shapePaintable = new RectangleIndicatorInstaller(targetBounds)
{
Template = (DataTemplate)canvasControl.TryFindResource("LayerPaintableRectangleTemplateKey")
};
canvasObject = shapePaintable.AddCanvasObject(canvasControl.CanvasContext, ((GraphControl)canvasControl).BackgroundGroup, targetBounds);
}