Get Graphpage's DataPlots contents into a tree
int gpage_get_plots( const GraphPage & pg, TreeNode & tr )
If success then return the plot type for the next added plot, or return 0 if error
EX1
void Run_gpage_get_plots() { Tree tr; GraphPage gp("graph1"); int nRet = gpage_get_plots(gp,tr); out_tree(tr); }
origin.h