I will repost this entry in due course. The original post broke a confidentiality agreement.
Using the latest code release of Openscales I will build a new demo, using code owned by WebMapSolutions, to demonstrate querying functionality. Two approaches are possible:
1) Using the data pulled from an initial WFS query (see http://flexmappers.com/openscalessolution)
2) Using the OGC standards to directly query the server.
Contact us to learn more about OpenScales.