This property enables or disables square markers in the legend area. If different marker shapes (circle, plus, triangle, and so on) are used for each series by UseSeriesShapes, the marker shape is redrawn within a square rectangle area. The legend marker position must not be set for the legend labels to appear on of the legend markers.
boolean = getSquareMarkers();
Can be one of the following:
true forces markers to be square. This value is the default.
false does not force markers to be square.
Note: This property is ignored if LegendMarkerPosition(4) is used.
See LegendMarkerPosition, UseSeriesShapes.