>Here is a reply from a co-worker that has used it in the past. If you need to clarify, I can put you in touch with her.

Thanks.

>This is a shortcut to assign a background color.
>
>1. Select the Color Dropper Tool from the toolbar on the left.
>2. Position the square pointer over the desired color in the Color Palette
>Area or in the image itself.
>3. Click the secondary mouse button.

I was clicking the left button. That might explains. I'll try this.