It looks like a new feature was added that allows you to select which data sets are to be displayed on a graph. I have manually done this with many of my programs and saw this was going to be a real time saver. If you enable autoscale Y and switch between data sets, the autoscale does not work. You have to add a property to detect the change and then force a refresh. Still it's cleaner than what I was doing, but wish it fully worked. To enable this feature, just right click on the label and make it visible.
Also noticed that if I dynamically change the labels on a digital graph using properties, that these do not get updated until I stop the program or drag it off the screen. The only work around I found was to turn off the graph then turn it back on. You can reproduce this problem without coding anything. Beware if you try and play with the digital graph properties that you save your work first. You may get something like this: