Template Graph

I'm trying to create a template graph using the tutorial data and following the tutorial guide. It works with only one trend, but when I add another trend it doesn't work. Additionally when I save the template graph with more than one trend line, close it, open the template graph again, open the saved template, highlight the channel of interest and click on generate graph - I get nothing. I've looked though teh help and the manual and can't figure out what is going on. Please help, thanks,
Amber