Fix to StoreUtils.RegisterClasses not being called.

prs.desktop/MainWindow.xaml.cs

@@ -313,6 +313,7 @@ public partial class MainWindow : IPanelHostControl
                     CoreUtils.RegisterClasses(typeof(TaskGrid).Assembly);
                     CoreUtils.RegisterClasses();
                     ComalUtils.RegisterClasses();
+                    StoreUtils.RegisterClasses();
                     PRSSharedUtils.RegisterClasses();
                     WPFUtils.RegisterClasses();
                     ReportUtils.RegisterClasses();