Reference IMessageDialog

  IMessageDialog = interface(IDialog)
  public
    { The message text }
    property Message: string read GetMessage write SetMessage;
    { The kind of message }
    property Kind: TMessageKind read GetKind write SetKind;
    { The captions of the buttons }
    property Buttons: StringArray read GetButtons write SetButtons;
    { The index of the button chosen or -1 }
    property ButtonIndex: Integer read GetButtonIndex;
  end;