This is pretty close, I think. I'm not sure this will upload as an editable PNG file. If it doesn't I'll make it available from my website. If it is editable, you'll be able to open it in Fireworks to see how it was done.
I've added a quick tutorial on my website
Linda, I thought that was an ingenious solution!
I was also reminded of this tutorial by Veerle on how to create gradient rings in Illustrator. She uses Illustrator's object blend capabilities to create the gradient, then defines it as an art brush so that it can be applied to the circular path.
Now that Illustrator CS6 supports gradient strokes, one can create this effect directly by drawing a circle and then setting the stroke option in the Gradient panel to "Apply gradient along stroke". It's almost too easy.
A gradient stroke along a path can almost be created in Fireworks by choosing Edit Stroke, selecting Sensitivity, and adjusting the Lightness (or Hue/Saturation, depending on the stroke color), but the result looks too fingerpainted to be usable.