type
  TForm1 = class(TForm)
    DBEdit1: TDBEdit;
    SpeedButton1: TSpeedButton;
    procedure DBEdit1KeyDown(Sender: TObject; var Key: Word;
      Shift: TShiftState);
    procedure SpeedButton1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.DBEdit1KeyDown(Sender: TObject; var Key: Word;
  Shift: TShiftState);
begin
    SpeedButton1Click(SpeedButton1);
end;

procedure TForm1.SpeedButton1Click(Sender: TObject);
begin
    ShowMessage('DBEdit1 KeyDown');
end;

end.