Adding median lines to xy scatter graph

Hi,

This is probably one for Andy, but ideas welcome from all.

I have two sets of data (i.e. several rows and two columns), both with values in the range 0 - 1. I'm plotting these on an xy scatter chart

The two median values for these two sets of data now need to be plotted on the chart as two lines, one horizontal and one vertical, effectively dividing the chart into 4 quadrants.

At the moment I've been achieving this functionality somewhat artificially, by superimposing 4 rectangle objects on the chart and adjusting their dimensions manually to coincide with the two median values on the two axes.

In addition I've been manually adding two text boxes each containing one of the median values and positioning it next to the appropriate median 'line'.

My question is this.

Is there a neater way of achieving this functionality without the somewhat artificial method of resorting to overlaid rectangles?

I can adjust the 4 rectangles programatically by changing the height and width property, but the text box needs to be positioned and there doesn't appear to be a Top and Left property.


All ideas gratefully received. Usual TIA