WPF Map Control Throws NullReferenceException

Question

This is a weird problem.  The exception only happens if I have a break point in my project that is hit before the project is fully loaded (before the window appears on the screen).  Not every break point causes the exception.  I have not been
able to pinpoint what particular break points do and do not cause it.  I think it might be break points that are hit before some event happens on the UserControl that is hosting the map control but if that is the case I am not sure what event that might
be.  If you remove the break point the application works fine.  Break points that are hit later in the application do not cause a problem.
Here is a copy of the exception:
System.NullReferenceException was unhandled
  HResult=-2147467261
  Message=Object reference not set to an instance of an object.
  Source=Microsoft.Maps.MapControl.WPF
  StackTrace:
       at Microsoft.Maps.MapControl.WPF.MapCore.AnimateViewUsingZoomAndPan(Double zoomLevel, Point centerNormalizedMercator)
       at Microsoft.Maps.MapControl.WPF.MapCore.SetViewInternal(Point centerNormalizedMercator, Double zoomLevel, Double heading)
       at Microsoft.Maps.MapControl.WPF.MapCore.SetView(LocationRect boundingRectangle)
       at GeoservicesControls.Views.GeofencingView.<>c__DisplayClass8.<ViewModelChangedCallback>b__0(LocationRect x) in d:\SoftwareDevelopment\AccessibleSolutions\GeoservicesControl\Source\GeoservicesControls\Views\GeofencingView.xaml.cs:line
121
       at System.Reactive.AnonymousSafeObserver`1.OnNext(T value)
       at System.Reactive.Concurrency.ObserveOn`1.ObserveOnSink.OnNextPosted(Object value)
       at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
       at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
       at System.Windows.Threading.DispatcherOperation.InvokeImpl()
       at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Windows.Threading.DispatcherOperation.Invoke()
       at System.Windows.Threading.Dispatcher.ProcessQueue()
       at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
       at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
       at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
       at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
       at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
       at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
       at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
       at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
       at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
       at System.Windows.Application.RunInternal(Window window)
       at System.Windows.Application.Run()
       at GeoservicesControl.Shell.Wpf.App.Main() in d:\SoftwareDevelopment\AccessibleSolutions\GeoservicesControl\Source\GeoservicesControl.Shell.Wpf\obj\Debug\App.g.cs:line 50
       at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()
  InnerException: 

Answer 1

The error message indicates that the error was thrown from the GeofencingView.xaml.cs file around line 121. Can you provide the code that you have in that area and the values being used.
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