Nice toolbox!
What exactly is the R coefficient that is displayed in the fit? Is this the same as R^2 from here: http://en.wikipedia.org/wiki/Coefficient_of_determination
I couldn't figure out though how I can fade in a figure. I tried to set the 'visible' property to 'off' first then set alpha to 0, but this doesn't work.
The only option that I found is something like this: