If you are using .NET Framework 3.5 Beta 2 to create WPF applications that support visual add-ins, you should be aware that, in the forthcoming .NET Framework 3.5 RTM, the naming of both the System.AddIn.Pipeline.VisualAdapters class and its members have changed from this [1] to this [2].

Consequently, you’ll need to change your code to use the new type and member names for .NET Framework 3.5/Visual Studio 2008 RTM.

[1] .NET Framework 3.5 Beta 2.0
namespace System.AddIn.Pipeline

{

    public static class VisualAdapters

    {

      public static INativeHandleContract ViewToContractAdapter(Visual);

      public static FrameworkElement ContractToViewAdapter(INativeHandleContract);

    }

}

 

[2] .NET Framework 3.5 RTM
namespace System.AddIn.Pipeline

{

    public static class FrameworkElementAdapters

    {

      public static INativeHandleContract ViewToContractAdapter(FrameworkElement);

      public static FrameworkElement ContractToViewAdapter(INativeHandleContract);

    }

}