You can show more values (time span) on the chart by increasing the MaxPoints property. This go round on the TrendChart is fairly limited. It's a starting point to begin getting feedback on which direction to go with it.I really like the data logger and Trender and am looking forward to further development.
I haven't found a way yet to do this, but is there a way to change the time span that the trender will show, or is this something you are working on?