Ronald Clark commented
The Derby portfolio minigraph - that cannot be changed - may not be as useful as graphs of the individual stocksthat are in the portfolio - or even ten small graphs of each of the ten. The Derby is useful in identifying, at any moment, what portfolios are outperforming and what stock within the portfolio is doing best. After picking the portfolio Derby identifies, I want to know about the idividual stocks. If any sort of graph on the Derby screen is going to be useful at that stage, quickly seeing graphs of those stocks individually, as opposed to a portfolio group, is what's useful.