I have already drawn some lines already,
MyGraph.Model = plot;
and now I want to let users display additional lines by checking on some options.
But the new line does not appear until the graph is redrawn (for example, resizing the window). Calling MyGraph.Model.RefreshPlot() make it appear but then that makes all successive new lines have the same colour. (If I do not
use RefreshPlot(), lines have random colours.)
What is the correct way to add new lines dynamically?