Parameter History\n

The list box contains a list of previous values for the
parameter you chose.

To delete a value, choose a value with a single click and 
then click on the 'delete' button.

The most recent value is selected initially.

Double-clicking on one of the previous values replaces the
current value with the previous value. (occaisionally there
is a bug which requires that you re-execute to see the change.)

Shift-click pops up a tool to display a value.
(works now for only solid colors and images.)

\nRemember Mouse-2 drag pans the view.