UI.Dialog =  Object.extend(UI.Dialog, {
  okButton        : [{title: 'Ok',     className: 'ok',     callback: function(win) { win.destroy(); }}],
  okCancelButtons : [{title: 'Ok',     className: 'ok',     callback: function(win) { win.destroy(); }},
                     {title: 'Cancel', className: 'cancel', callback: function(win) { win.destroy(); }}]
});