title: Is there a Close command for dialog boxes in the WPF command infrastructure?
body: <p>Should I use <code>ApplicationCommands.Close</code> for closing modal dialog boxes or is that command considered reserved for closing the application?  If it is the latter, do folks create <code>Close</code> commands for each <code>Dialog</code> box or just a single <code>Close</code> command for all their modal dialog boxes?</p>