>>Assume this class:

public partial class Library : EntityObject
>>    {
>>         public Library Parent
>>        {
>>            get { return new Library();}
>>         }
>>    }

As you may guess given the EntityObject inheritance the really thing is more complex, generated by the EDMX builder and cannot be modified. I'd like it to implement an Interface:

public interface ITreeview
>>    {
>>        ITreeview Parent { get; }
>>    }

But (I suppose expectedly) adding this won't compile:

public partial class Library : ITreeview
>>    {
>>    }

Is there anyway of achieving what I want ?
>
>And yes, that should compile, as long as you implement ITreeview in your custom partial class..

The Library class (as in the first snippet above) has the 'Parent' property which is an instance of the Library class - but to compile it would have to be defined as ITreeview.Parent