unfortunately this needs to be done in Preview mode. the reason is that Design mode only shows 4 items in the Legend and 4 lines in the main chart box.
if you have the full crystal reports designer, then you can change the record selection so that the chart has at least 11 lines in the chart preview. after you've changed those 11 lines and saved your reports, the next time you refresh the report, those 11 lines should still have the shapes that you assigned.
if you do not have the full crystal reports designer and you can only do this with code, then please post your question to the cr for visual studio forum.
thanks,
jamie