I am trying to update RichEdit so that it detects URL and enables clicking on it to open in the browser. Detecting URL is easy, I just use the following code from http://www.scalabium.com/faq/dct0146.htm

mask := SendMessage(MNote.Handle, EM_GETEVENTMASK, 0, 0);
  SendMessage(MNote.Handle, EM_SETEVENTMASK, 0, mask or ENM_LINK);
  SendMessage(MNote.Handle, EM_AUTOURLDETECT, Integer(True), 0); 

but the second part doesn't work for me. They give the following code to capture EN_LINK message and processing it:

type
  TForm1 = class(TForm)
  protected
    procedure WndProc(var Message: TMessage); override;
  end;
...

procedure TForm1.WndProc(var Message: TMessage);
var
  p: TENLink;
  strURL: string;
begin
  if (Message.Msg = WM_NOTIFY) then
  begin
    if (PNMHDR(Message.LParam).code = EN_LINK) then
    begin
      p := TENLink(Pointer(TWMNotify(Message).NMHdr)^);
      if (p.msg = WM_LBUTTONDOWN) then
      begin
        SendMessage(RichEdit1.Handle, EM_EXSETSEL, 0, LongInt(@(p.chrg)));
        strURL := RichEdit1.SelText;
        ShellExecute(Handle, 'open', PChar(strURL), 0, 0, SW_SHOWNORMAL);
      end
    end
  end;

  inherited;
end;

When I run the program, URL is detected, but clicking on it doesn't do anything. Using debug I found out that Message.Msg = WM_NOTIFY is not true when I click on URL. I then tried to override TRichEdit's WndProc, but result is the same. Any suggestions?