Gradient\n

\nClicking 'Add'  adds a color to the 
gradient.  Currently you can add only two colors 
to the gradient.  The first will be the starting color.
The second will be the ending color. Additional added colors
will be ignored.

\nClicking the second mouse button on 'Add' clears the gradient colors.

\nClicking the 'Off-H-V' button rotates among the three values.
When 'Off' is selected, clicking on any of the color parameter
buttons sends a solid color.  If 'H' or 'V' is selected,
clicking on the color parameter buttons sends a gradient (horizontal
or vertical).

\n Clicking the second mouse button on 'Off-H-V' will bring up a 
panel that allows you to select the number of intermediate colors
to draw in the gradient.