Wizard shows exception under special circumstance

Dear support team,
I have a problem with the WizardDialogController which shows an exception (below this message) by clicking on cancel button.
It seems to be a bug and I cannot get rid of it (and also cannot work around)
The exception only comes if in a step when view of the step shows a nested listview. in other steps which doesn't contains a nested listview (like welcome or goodbye) cancel action works.

I call the wizard by a simple action (as in your feature center solution).

I attached a sample solution so you can reproduce this bug. included also a screenshot (readme.jpg)

thanks a lot!!

Kai

this is the described exception message:

System.NullReferenceException: Der Objektverweis wurde nicht auf eine Objektinstanz festgelegt.
bei DevExpress.ExpressApp.Xpo.XPObjectSpace.FindObjectXPClassInfo(Object obj)
bei DevExpress.ExpressApp.Xpo.XPObjectSpace.GetKeyValue(Object obj)
bei DevExpress.ExpressApp.SystemModule.StandaloneOrderProvider.Initialize(IObjectSpace objectSpace, IList objects)
bei DevExpress.ExpressApp.SystemModule.StandaloneOrderProvider..ctor(IObjectSpace objectSpace, IList objects)
bei DevExpress.ExpressApp.SystemModule.RecordsNavigationController.OnDeactivated()
bei DevExpress.ExpressApp.Controller.activeList_ResultValueChanged(Object sender, BoolValueChangedEventArgs e)
bei DevExpress.ExpressApp.Utils.BoolList.OnResultValueChanged(Boolean oldResultValue, Boolean resultValue)
bei DevExpress.ExpressApp.Utils.BoolList.EndUpdate()
bei DevExpress.ExpressApp.Utils.BoolList.set_Item(String key, Boolean value)
bei DevExpress.ExpressApp.Frame.c__DisplayClass4.b__1()
bei DevExpress.Persistent.Base.SafeExecutor.Execute(Method method, Object targetObject, String targetObjectIdentifier)
bei DevExpress.ExpressApp.Frame.Dispose()
bei DevExpress.ExpressApp.Editors.ListPropertyEditor.Dispose(Boolean disposing)
bei DevExpress.ExpressApp.Editors.ViewItem.b__0()
bei DevExpress.Persistent.Base.SafeExecutor.Execute(Method method, Object targetObject, String targetObjectIdentifier)
bei DevExpress.ExpressApp.Editors.ViewItem.Dispose()
bei DevExpress.Persistent.Base.SafeExecutor.c__DisplayClass1.b__0()
bei DevExpress.Persistent.Base.SafeExecutor.Execute(Method method, Object targetObject, String targetObjectIdentifier)
bei DevExpress.Persistent.Base.SafeExecutor.Dispose(IDisposable targetObject, String targetObjectIdentifier)
bei DevExpress.ExpressApp.CompositeView.ClearItems()
bei DevExpress.ExpressApp.CompositeView.DisposeCore()
bei DevExpress.ExpressApp.DetailView.DisposeCore()
bei DevExpress.ExpressApp.View.b__1()
bei DevExpress.Persistent.Base.SafeExecutor.Execute(Method method, Object targetObject, String targetObjectIdentifier)
bei DevExpress.ExpressApp.View.Dispose()
bei Xafari.Controllers.WizardDialogController.Dispose(Boolean disposing)
bei System.ComponentModel.Component.Dispose()
bei DevExpress.Persistent.Base.SafeExecutor.c__DisplayClass1.b__0()
bei DevExpress.Persistent.Base.SafeExecutor.Execute(Method method, Object targetObject, String targetObjectIdentifier)
bei DevExpress.Persistent.Base.SafeExecutor.Dispose(IDisposable targetObject, String targetObjectIdentifier)
bei DevExpress.ExpressApp.Frame.Dispose()
bei DevExpress.ExpressApp.Win.WinShowViewStrategyBase.DisposeDialogWindow(WinWindow window)
bei DevExpress.ExpressApp.Win.WinShowViewStrategyBase.ShowViewInModalWindow(ShowViewParameters parameters, ShowViewSource showViewSource)
bei DevExpress.ExpressApp.Win.MdiShowViewStrategy.ShowViewInModalWindow(ShowViewParameters parameters, ShowViewSource showViewSource)
bei DevExpress.ExpressApp.ShowViewStrategyBase.ShowViewCore(ShowViewParameters parameters, ShowViewSource showViewSource)
bei DevExpress.ExpressApp.Win.MdiShowViewStrategy.ShowViewCore(ShowViewParameters parameters, ShowViewSource showViewSource)
bei DevExpress.ExpressApp.ShowViewStrategyBase.ShowView(ShowViewParameters parameters, ShowViewSource showViewSource)
bei DevExpress.ExpressApp.Frame.ProcessActionCreatedView(ActionBaseEventArgs e)
bei DevExpress.ExpressApp.Win.WinWindow.ProcessActionCreatedView(ActionBaseEventArgs e)
bei DevExpress.ExpressApp.Frame.ShowViewAction_ProcessCreatedView(Object sender, ActionBaseEventArgs e)
bei DevExpress.ExpressApp.Actions.ActionBase.OnProcessCreatedView(ActionBaseEventArgs e)
bei DevExpress.ExpressApp.Actions.ActionBase.ExecuteCore(Delegate handler, ActionBaseEventArgs eventArgs)