RSRP-235831: Generating Delegating Members

There's a problem with generation of delegating members. I set up a simple class with only one private field of string. When I wanted to generate members to delegate calls to that string, the menuitem "delegating members" in the "generate code" menu was inactive. When I cange the Type of the field to let's say Control all seems to work fine.

using System;

namespace ReSharperExample {
  public class WontCreateMembers {

    //private String _decorated (typename insteadof keyword) also doesn't work
    private string _decorated;
  }

  public class WillCreateMembers {

    private Type _decorated;
  }
}