The adapter for the CreateUserWizard web control doesn't support the attribute ContinueDestinationPageUrl. As mentioned in the white paper for the kit, not all attributes are supported in these sample adapters. This is always disappointing to hear. Sorry.
In a future rev of the kit, Heidi and I can consider adding support for that attribute.
Speaking of enhancements to the kit, let me give you some background... Microsoft commissioned Groovy bits (Heidi and me) to build this adapter kit. The ASP.NET team was farsighted; they built this amazing control adapter architecture into the ASP.NET framework. Groovy bits was asked to create a set of adapters to demonstrate the power of this adapter architecture. Simultaneously, Microsoft wanted to give the community a nifty way to make some of the existing ASP.NET controls easier to style with CSS (via the use of these adapters).
Bugs and areas that ought to be enhanced will, hopefully, be resolved over time as Microsoft releases new revisions to this CSS Friendly adapter kit. Microsoft currently plans to ask Groovy bits to create those future revisions of the kit. That's simply logical since Heidi and I are the ones who know the most about the code at this point, having invented it. Of course Microsoft owns all of this stuff so they are free to put other development resources to task on this if they prefer. For the immediate future, however, it looks like Heidi and I will continue to be the ones working on improvements to the kit. Since the first official (non-beta) rev of the adapters was released so recently, we are currently in a mode where we simply monitor the community response (on this forum and elsewhere). The idea is to get a good, solid set of feedback on the adapters and then plan what to fix or improve next.