Dialog box that can display a long text, with automatic vertical scrollbar. You can also add buttons at the bottom. You can also have an input text area. This can be used to make either a modal or non-modal dialog boxes.
See CastleMessages for routines that intensively use this dialog underneath, giving you easy MessageXxx routines that ask user for confirmation and such.
Set this to True to signal that modal dialog window should be closed. This is not magically handled — if you implement a modal dialog box, you should check in your loop whether something set Answered to True.