Gradient Editor

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Enables you to modify the gradients
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Left click at the slide bar to add a new color box to your gradient.
You can slide color boxes to change their positions, to remove a
color box simply drag it out of the gradient control. To change a
color, click twice on the color box. You can also select the color
box and with the pipette, click in the color panel. Some gradients
allow transparent colors. To duplicate a color, press the Alt key,
left click at the color box and drag it to its new position. You can
also, right click on the gradient editor to open a popup menu, and
choose a function.