就像TBitBtn这样:
{************************************************************************}
unit BitBtnEx;

interface

uses
  Windows, Messages, SysUtils, Classes, Controls, StdCtrls, Buttons;

type
  TBitBtnEx = class(TBitBtn)
  private
    { Private declarations }
  protected
    { Protected declarations }
  public
    { Public declarations }
  published
    { Published declarations }
  end;

procedure Register;

implementation

procedure Register;
begin
  RegisterComponents('Samples', [TBitBtnEx]);
end;

end.

{************************************************************************}
可以吗?