Set data plot symbol based by index of one in the symbol gallery.
BOOL SetSymbol( int nIndex, BOOL bUndo = FALSE )
TRUE for success, otherwise FALSE.
//make sure there exists a graph with dataplots on it before running this code.
GraphLayer gl = Project.ActiveLayer();
if ( gl )
DataPlot dp = gl.DataPlots(0); //get the first dataplot on graphlayer
if ( dp )
if ( dp.SetSymbol(11) ) //set symbol as solid circle
printf("SetSymbol change DataPlot symbol to " + dp.GetSymbol());