Transparent color

Hi all -

In light of the deadline that we have here, I'm just going to ask
this instead of doing what I should and actually read some stuff.
;) We're trying to display probability information over a map in
a gridcell fashion. Each range of probability has an associated
color. However, we want to be able to see the map through the
colors. Is there a way to specify transparency for the fill color
of the OMRect object (or any OMGraphic for that matter)?

Thanks and I apologize for not RTFM'ing. ;)

  - Chris

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