type
TForm1 = class(TForm)
TrackBar1: TTrackBar;
procedure FormCreate(Sender: TObject);
private
procedure AppMessage(var Msg: TMsg; var Handled: Boolean);
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.DFM}
procedure TForm1.AppMessage(var Msg: TMsg; var Handled: Boolean);
begin
if MSG.hwnd = TrackBar1.Handle then
if Msg.message = WM_LBUTTONDOWN then
beep;
end;
procedure TForm1.FormCreate(Sender: TObject);
begin
Application.OnMessage:=AppMessage;
end;