When I create a pie chart with a legend and there is not enough room to show them separately, part of the pie chart covers the legend. In cartesian charts, the legend always appears on top of the charts. I would like to know how I can make the legend appear in front of (i.e. on top of) the pie chart rather than behind it when the legend and the pie chart overlap.

For an example, compare the two attached images. One shows a cartesian chart and the other shows a pie chart.