Create custom display attribute using or inherits DisplayAttribute in ASP.NET MVC

I want to use DisplayAttribute with Name property.

The problem is that class is sealed and I cannot inherits it to override some methods.

Why I want this ?

I want to pass some a code in order to translate strings to Name property. And add one property for language.

Something like:

[MyDisplay(Code = TRANSLATION_CODE, Language = "FR-FR")]
public string Fr { get; set; }

And inside MyDisplayAttribute, I want to do like:

public class MyDisplayAttribute: DisplayAttribute // it won't work the inherits
{
     public int Code { get; set; }
     public string Language { get; set; }

    // somewhere, I don't know what method
    // I want to assing `Name = GetTranslation(Code, Language);`
}

There is another way to do that ?

UPDATE

I tried also this:

public class MyDisplayAttribute : DisplayNameAttribute
   {
      private int _code;
      private string _language;

      public MyDisplayAttribute( int code, string language )
         : base( language )
      {
         _code = code;
         _language = language;
      }

      public override string DisplayName
      {
         get
         {
            // here come LanguageTranslatorManager
            if ( _code == 1 && _language == "en" ) {
               return "test";
            }

            return base.DisplayName;
         }
      }
   }

and in model:

  [MyDisplay( 1, "en" )]
  public string Test
  {
     get;
     set;
  }

I'm expecting to display test in view, but doesn't ! Where is my mistake ?