MessageDlg defualt button

How can I use from other syntaxes of MessageDlg function.
It's first syntax has 4 parameters that works proparely, but other syntaxes (overload) that have more than 4 parapeters don't work!!!
For example in the 6-parapeter that 5th parameter is for defining default button and 6th parameter is for Tbitmap don't work.!!!

this is the example of delphi help, but it doesn't work too!!!

procedure TForm1.Button1Click(Sender: TObject);
---------------
begin
  if MessageDlg('Welcome to my Delphi application.  Exit now?',
    mtConfirmation, [mbYes, mbNo], 0, mbYes) = mrYes then
  begin
    MessageDlg('Exiting the Delphi application.', mtInformation,
      [mbOk], 0, mbOk);
    Close;
  end;

end;
-----------------

Please guide me! Thanks
LVL 1
EhsunAsked:
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kretzschmarConnect With a Mentor Commented:
you could use the windows.messagebox-API like

  if windows.messagebox(self.handle,  //handle
                       'MyMessageText',  //text
                       'MyMessageCaption' //Caption
                       ,MB_ICONINFORMATION or  //Icon to Show
                        mb_YesNoCancel or  //ButtonSet
                        MB_DEFBUTTON2) //Default Button (No in this Case)
                        = mrYes then;

meikl ;-)
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TyrsisCommented:
The MessageDlg's listed in the help file are actually for the CLX.  You'll have to use CLX if you want to use those versions of MessageDlg().  Or you can try copying the code out of QDialogs if you want to use it with VCL.  The VCL version of MessageDlg only has one version. (The first one listed I believe)

Tyrsis
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lmikleCommented:
Add a QDialogs to uses cause to get access to MessageDlg qith 6 parameters.
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DelaniCommented:
What you really need is the standard VCL function Application.MessageBox, which wraps around the windows API. (You can look it up in the Delphi helpfile).

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