Unique Value Renderer

Hi,

I've created a workflow that uses a geoprocessing task to produce a featureset of polygons. Each polygon has an associated Business ID and the featureset will contain a number of polygons associated with the same business. What I'm trying to do is use the UpdateGraphicsLayer activity to display the polygons symbolised for each unique business ID. I believe that what I need to use in the Renderer field is  New ESRI.ArcGIS.Client.UniqueValueRenderer() however I'm not sure what the correct syntax should be to define a fill colour for each unique value.

Any suggestions would be greatly appreciated.

Kevin