Create a class as property

Question

Hi.
I have a class named 'MAIN'. within it there is a nested class named 'NESTED' and it is a private class.
in MAIN class, I declared an object of NESTED class.
How can I create a public property that represents that object.

Here's a sample code:

 public class MAIN
{
   public MAIN()
   {
      nest = new NESTED();
   }
   NESTED nest;
   class NESTED
   {
   }
   public NESTED nested
   {
      get
      {
         return nest;
      }
      set
      {
         nest = value;
      }
   }
}

In this code, Compiler Creates error because NESTED class accessibility is private and nest object is public.
What Should I do?
Thanks.