Bind Combobox with classes who inherit interface using MEF(Managed extensibility framework ..

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C#

Windows

C#4.0

combobox

MEF

, +

Please under stand the flow of code .
I have an interface Ishape which in some separate dll or class library.

[InheritedExport]
    public interface Ishape
    {

        int Paint(int width, int height);

    }

In my window application I have two classes.

public class Circle : MEF_Test.Ishape
   {
       public int Paint(int width, int height)
       {

           return 0;
       }

   }
   [Export(typeof(Ishape))]
   public class Rect : MEF_Test.Ishape
   {
       public int Paint(int width, int height)
       {

           return 0;
       }

   }

I want to bind class names in combobox who inherit interface IShape .
I am new to both window application and MEF ( managed extensibilty Framework )

Please somebody help . I need it as soon as possible .

Thanks in advance
Regard