Soultion Explorer and Microsoft.VisualStudio.Package.Project sources

Hi

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                I have a managed VSPackage that was using the Microsoft.VisualStudio.Package.Project.dll to implement the project hierarchy.  I have created an assembly from the source code that was distributed with the October VS SDK and am having trouble with my project not expanding in the Solution explorer.  When I look at the DTE object and pull out the project object I can see under the projectItems that all of my source files have been added from the template files OK.   When I try to expand the project in the Solution explore nothing happens.  Any ideas as what interfaces or events to look at  

                I looked at the documentation for references to the Microsoft.VisualStudo.Package.Project source but was not able to find anything.  Is it not included yet or am I just not looking in the correct place   I see that some of the examples still make references to the dll.  

Thanks

Mark Cooper