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TBlub = class(B1)
public
  propryt Name;
end;					

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  TMyCustomClass = class(TAnotherClass)
  private
    FTest: Longint;
  protected
    property Test: Longint read FTest write FTest;
  public
    constructor Create(bla: Tbla); override;
    destructor Destroy; override;
    procedure Assign(Source: TPersistent); override;
  end;					

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  TMyDerivedClass = class(TMyCustomClass)
  private
    FDescription: TCaption
  published
    property Description: TCaption read FDescription write FDescription;
  end;					

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procedure Test;
var
  MyItem: TMyDerivedClass;
begin
  MyItem := TMyDerivedClass.Create;
  MyItem.Test := 0; // <<<<<< Das funktioniert natürlich nicht
end;					

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TMyCustomClass = class(TAnotherClass)
  private
    FTest: Longint;
  protected
    property Test: Longint read FTest write FTest;
  public
    constructor Create(bla: Tbla); override;
    destructor Destroy; override;
    procedure Assign(Source: TPersistent); override;
  end;

TMyDerivedClass = class(TMyCustomClass)
  private
    FDescription: TCaption
  published
    property Test: Longint read Test write Test;
    property Description: TCaption read FDescription write FDescription;
  end;

//alternative, wenn das obige nicht funktionieren sollte:
TMyDerivedClass2 = class(TMyCustomClass)
  private
    FDescription: TCaption
    procedure WriteTest(value:longint);
    function ReadTest:Longint;
  published
    property Test: Longint read ReadTest write WriteTest;
    property Description: TCaption read FDescription write FDescription;
  end;

implementation

procedure TMyDerivedClass.WriteTest;
begin
   Test:=value;
end;

function TMyDerivedClass.ReadTest:LongInt;
begin
   result:=Test;
end;					

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Published
  Property Test;
end;					

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 type TAncestor = class
  private
    _test: Integer;
  protected
    Property Test: Integer read _test write test;
end;

type TDerive = class( TAncestor )
  published // oder public - wie einem beliebt
    Property Test;
end;					

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THackTest = class(TMyCustomClass)
public
  property Test;
end;					

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procedure Test;
var
  MyItem: TMyDerivedClass;
begin
  MyItem := TMyDerivedClass.Create;
  THackTest(MyItem).Test := 0;
end;