MessageDlg Example
MessageDlg('Save changes?', mtConfirmation, mbYesNoCancel, 0);
mtWarning A message box containing a yellow exclamation point symbol.
mtError A message box containing a red stop sign.
mtInformation A message box containing a blue "i".
mtConfirmation A message box containing a green question mark.
mtCustom A message box containing no bitmap. The caption of the message box is the name of the application's executable file.