Here's a slightly more abstracted approach. Will span every pixel with a square region around selected point. I really don't like any of the ghost entities or filled solutions.

void canvas1_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
    int ClickMargin = 2;// Adjust here as desired. Span is in both directions of selected point.
    var ClickMarginPointList = new Collection<Point>();
    Point ClickedPoint = e.GetPosition(canvas1);
    Point ClickMarginPoint=new Point();
    for (int x = -1 * ClickMargin; x <= ClickMargin; x++)
    {
        for (int y = -1 * ClickMargin; y <= ClickMargin; y++)
        {
            ClickMarginPoint.X = ClickedPoint.X + x;
            ClickMarginPoint.Y = ClickedPoint.Y + y;
            ClickMarginPointList.Add(ClickMarginPoint);
        }
    }

    foreach (Point p in ClickMarginPointList)
    {
        HitTestResult SelectedCanvasItem = System.Windows.Media.VisualTreeHelper.HitTest(canvas1, p);
        if (SelectedCanvasItem.VisualHit.GetType().BaseType == typeof(Shape))
        {
            var SelectedShapeTag = SelectedCanvasItem.VisualHit.GetValue(Shape.TagProperty);
            if (SelectedShapeTag!=null &&  SelectedShapeTag.GetType().BaseType == typeof(Hole))
            {
                Hole SelectedHole = (Hole)SelectedShapeTag;
                SetActivePattern(SelectedHole.ParentPattern);
                SelectedHole.ParentPattern.CurrentHole = SelectedHole;
                return; //Get out, we're done.
            }
        }
    }
}

>
>Hi,
>I think I've done this in the past by creating a region (say a rectangular one based on your four points) then using the .Union() method against each object of interest. If the result is null then the object is not within the region. (This can also be used for selecting muliple objects). It's possible that none of your four points will actually fall within the ellipse even though the initial point is very close to it..
>Haven't access to .NET at the moment so I can't test it.....
>Best,
>Viv