The data for the Chart is defined in the Applet parameters. The params are also used to indicate
that all views are needed and that initially 'Bar' Chart view is needed, and set the thickness
of pie to a non default value.
When you move mouse, in bar and line graph views notice red and green ovals.
The green indicates there is layer below that item.
Press 'Up' arrow key to 'drill up' when you are in lower layers.