Following on from this previous post a tip that I'd pass on about hosting the designer.

I've been finding it a bit confusing to work out which services I need to add in order to affect which functionality. One of the ways in which I've tried to work this out is by doing my usual trick of using the;

Debug->Exceptions->CLR Exceptions

dialog box in Visual Studio so that when any sample I'm running throws an exception I can see what those exceptions are even if they are ultimately caught by the application. With the Workflow Designer hosting this has been quite useful in letting me see that certain services are missing from the configuration.