public InfoWarningErrorMessageController()
{
Current.ServiceChanged += EhServiceChanged;
_unreversedDoc = new ObservableCollection <InfoWarningErrorTextMessageItem>();
_reversedDoc = new Collections.ObservableCollectionReversingWrapper <InfoWarningErrorTextMessageItem>(_unreversedDoc);
_currentDoc = _unreversedDoc;
_commandClearAllMessages = new RelayCommand(EhClearAllMessages);
_commandReverseMessages = new RelayCommand(EhReverseAllMessages);
_shutDownService = new CachedService <IShutdownService, IShutdownService>(false,
(shutdownService) => shutdownService.Closed += EhApplicationClosed,
(shutdownService) => shutdownService.Closed -= EhApplicationClosed);
_shutDownService.StartCaching();
var memento = Current.PropertyService.GetValue(PropertyKeyMessageControlState, RuntimePropertyKind.UserAndApplicationAndBuiltin, () => null);
if (null != memento)
{
SetMemento(memento);
}
EhServiceChanged();
}