I typically use a list box or a tree control to index the plots array so that only the desired plots are displayed. The list box is much easier to use, but the tree control remembers your click order. That useful if you select element 2, 5 , and then 3; they will be plotted as plot0=element 2, plot1=element 5, and plot2=element 3. If a lower element is added, all the other plots won't change color like they will with a listbox. I can whip up an example if you'd like.
btw, I like your sig.
Chris