Crashes when trying to see details of System.Windows.Forms.WebBrowser

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What steps will reproduce the problem?
1. Execute in f#Interactive
let browser = new System.Windows.Forms.WebBrowser()
2. fseye pops up
3. browser variable is shown
4. trying to expand the browser-treenode result in closing the fseye-window and 
the following exceptions appear in f#interactive:

 System.NullReferenceException: Object reference not set to an instance of an object.
   at Swensen.FsEye.WatchModel.getPropertyWatch@181(Object ownerValue, Type ownerTy, PropertyInfo pi)
   at Swensen.FsEye.WatchModel.getMemberWatches@253-2.Invoke(MemberInfo m)
   at Microsoft.FSharp.Collections.IEnumerator.map@109.DoMoveNext(b& )
   at Microsoft.FSharp.Collections.IEnumerator.MapEnumerator`1.System-Collections-IEnumerator-MoveNext()
   at Microsoft.FSharp.Core.CompilerServices.RuntimeHelpers.takeOuter@675[T,TResult](ConcatEnumerator`2 x, Unit unitVar0)
   at <StartupCode$FSharp-Core>.$Seq.MoveNextImpl@775.GenerateNext(IEnumerable`1& next)
   at Microsoft.FSharp.Core.CompilerServices.GeneratedSequenceBase`1.MoveNextImpl()
   at Microsoft.FSharp.Core.CompilerServices.GeneratedSequenceBase`1.System-Collections-IEnumerator-MoveNext()
   at Microsoft.FSharp.Collections.IEnumerator.map@109.DoMoveNext(b& )
   at Microsoft.FSharp.Collections.IEnumerator.MapEnumerator`1.System-Collections-IEnumerator-MoveNext()
   at Microsoft.FSharp.Collections.IEnumerator.map@109.DoMoveNext(b& )
   at Microsoft.FSharp.Collections.IEnumerator.MapEnumerator`1.System-Collections-IEnumerator-MoveNext()
   at Microsoft.FSharp.Core.CompilerServices.RuntimeHelpers.takeOuter@675[T,TResult](ConcatEnumerator`2 x, Unit unitVar0)
   at <StartupCode$FSharp-Core>.$Seq.MoveNextImpl@775.GenerateNext(IEnumerable`1& next)
   at Microsoft.FSharp.Core.CompilerServices.GeneratedSequenceBase`1.MoveNextImpl()
   at Microsoft.FSharp.Core.CompilerServices.GeneratedSequenceBase`1.System-Collections-IEnumerator-MoveNext()
   at Microsoft.FSharp.Collections.SeqModule.ToArray[T](IEnumerable`1 source)
   at <StartupCode$FsEye>.$WatchTreeView.loadWatches@159(WatchTreeView this, SynchronizationContext context, TreeNode node, Watch watch)
   at <StartupCode$FsEye>.$WatchTreeView.-ctor@203-14.Invoke(TreeViewEventArgs args)
   at Microsoft.FSharp.Control.CommonExtensions.SubscribeToObservable@1777.OnNext(T value)
   at Microsoft.FSharp.Core.CompilerServices.RuntimeHelpers.h@744.Invoke(Object _arg1, TArgs args)
   at <StartupCode$FsEye>.$WatchTreeView.-ctor@203-13.Invoke(Object sender, TreeViewEventArgs e)
   at System.Windows.Forms.TreeView.OnAfterExpand(TreeViewEventArgs e)
   at System.Windows.Forms.TreeView.TvnExpanded(NMTREEVIEW* nmtv)
   at System.Windows.Forms.TreeView.WmNotify(Message& m)
   at System.Windows.Forms.TreeView.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
Stopped due to error
Microsoft.FSharp.Compiler.ErrorLogger+StopProcessing: Exception of type 
'Microsoft.FSharp.Compiler.ErrorLogger+StopProcessing' was thrown.
   at Microsoft.FSharp.Compiler.Interactive.Shell.ErrorLoggerThatStopsOnFirstError.AbortOnError()
   at Microsoft.FSharp.Compiler.Interactive.Shell.threadException@2131-1.Invoke(Unit unitVar0)
   at Microsoft.FSharp.Compiler.Interactive.Shell.threadException@2129[a](ErrorLoggerThatStopsOnFirstError errorLogger, a exn)
   at System.Windows.Forms.Application.ThreadContext.OnThreadException(Exception t)
   at System.Windows.Forms.Control.WndProcException(Exception e)
   at System.Windows.Forms.Control.ControlNativeWindow.OnThreadException(Exception e)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
   at System.Windows.Forms.UnsafeNativeMethods.SendMessage(HandleRef hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)
   at System.Windows.Forms.Control.SendMessage(Int32 msg, IntPtr wparam, IntPtr lparam)
   at System.Windows.Forms.Control.ReflectMessageInternal(IntPtr hWnd, Message& m)
   at System.Windows.Forms.Control.WmNotify(Message& m)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ScrollableControl.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
Stopped due to error
Microsoft.FSharp.Compiler.ErrorLogger+StopProcessing: Exception of type 
'Microsoft.FSharp.Compiler.ErrorLogger+StopProcessing' was thrown.
   at Microsoft.FSharp.Compiler.Interactive.Shell.ErrorLoggerThatStopsOnFirstError.AbortOnError()
   at Microsoft.FSharp.Compiler.Interactive.Shell.threadException@2131-1.Invoke(Unit unitVar0)
   at Microsoft.FSharp.Compiler.Interactive.Shell.threadException@2129[a](ErrorLoggerThatStopsOnFirstError errorLogger, a exn)
   at System.Windows.Forms.Application.ThreadContext.OnThreadException(Exception t)
   at System.Windows.Forms.Control.WndProcException(Exception e)
   at System.Windows.Forms.Control.ControlNativeWindow.OnThreadException(Exception e)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
   at System.Windows.Forms.UnsafeNativeMethods.CallWindowProc(IntPtr wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)
   at System.Windows.Forms.NativeWindow.DefWndProc(Message& m)
   at System.Windows.Forms.Control.DefWndProc(Message& m)
   at System.Windows.Forms.TreeView.WmMouseDown(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.TreeView.WndProc(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)


What version of the product are you using? On what operating system?
Windows 7 64-bit
VS 2010 .net 4.0
fseye 1.0.0-final

Original issue reported on code.google.com by Frederik...@gmail.com on 28 Feb 2012 at 4:20