{ Расширение DBNavigator: позволяет разработчику включать и выключать
отдельные кнопки через методы EnableButton и DisableButton }

unit GNav;

interface

uses

  Windows, Messages, SysUtils, Classes, Graphics, Controls,
  Forms, Dialogs, ExtCtrls, DBCtrls;

type
  TMyNavigator = class(TDBNavigator)
  public
    procedure EnableButton(Btn: TNavigateBtn);
    procedure DisableButton(Btn: TNavigateBtn);
  end;

procedure Register;

implementation

procedure TMyNavigator.EnableButton(Btn: TNavigateBtn);
begin
  Buttons[Btn].Enabled := True;
end;

procedure TMyNavigator.DisableButton(Btn: TNavigateBtn);
begin
  Buttons[Btn].Enabled := False;
end;

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

end.