WPF: Opacity and the MouseEnter Event

As part of a diagram开发者_开发技巧, I am drawing a few overlapping Shapes, each with Opacity=0.5, like here:

<Grid>
    <Rectangle Fill="Blue" Opacity="0.5" MouseEnter="Rectangle_MouseEnter" />
    <Rectangle Fill="Red" Opacity="0.5" />
</Grid>


private void Rectangle_MouseEnter(object sender, MouseEventArgs e)
  {
     MessageBox.Show("Entered");
  }

When the user enters the shape with the mouse, some additional information should be displayed, but the event handler never gets called.

Is there a way to get MouseEnter events for all Shapes, instead of just the topmost one?

With your layout only the topmost rectangle will raise MouseEnter event. It fully overlaps the first rectangle.

Try this code for eventHandler:

private void Rectangle_MouseEnter(object sender, MouseEventArgs e)
        {
            if (sender != grid.Children[0])
            {
                var rect = (grid.Children[0] as Rectangle);
                if (rect != null) rect.RaiseEvent(e);
            }
            else
            {
                MessageBox.Show("Entered.");
            }
        }

For this works you need to subscribe both rectangles to Rectangle_MouseEnter.