Got "select category" view working.

Fixed <webflow:flow-registry> entry - needed flow-builder-services
attribute referencing mvcViewFactoryCreator

Needed to add id="createOrders" to <webflow:flow-location> -- otherwise
flow has id "createOrders-flow"
Renamed createOrders-flow.xml to createOrders.xml so that implicit flow
id is "createOrders" not "createOrders-flow"
- using <webflow:flow-location> the flow id is based on file name less
extension 
- c.f. using <webflow:flow-location-pattern> the flow id is based on
parent folder name (after skipping base-path)