Create a new layer above all the others.
Open the “fill” and “mixer” panels.
here is a pic of the two panels open from my rayoflight tutorial
Select the rectangle creation tool.
Deselect the stroke.
In the fill panel, from the pull down, select “linier gradient”.
You’ll see the panel apear like the one in my picture above, with two handles discribing the gradient.
Select the tab on the side of the gradient that you wish to be solid, and in the swatch, choose the color white.
Select the other tab and again, in the swatch, choose white.
With this tab still selected, select the “fill” swatch in the “mixer” panel. Take the “alpha” slider in the mixer panel and move it to 0%.
Now discribe your rectangle on the stage.
For more info on how these two panels work together to produce alpha gradients check out my tutorial, “rayoflight revisited” at www.centerspin.com.