Получить данные о Grid

System.NullReferenceException не обработано
HResult=-2147467261
Message=Ссылка на объект не указывает на экземпляр объекта.
Source=Test
StackTrace:
в Test.MainWindow.G1_LayoutUpdated(Object sender, EventArgs e) в c:\Users\Michael\Desktop\Test\Test\MainW indow.xaml.cs:строка 46
в System.Windows.ContextLayoutManager.fire LayoutUpdateEvent()
в System.Windows.ContextLayoutManager.Upda teLayout()
в System.Windows.Interop.HwndSource.SetLay outSize()
в System.Windows.Interop.HwndSource.set_Ro otVisualInternal(Visual value)
в System.Windows.Window.SetRootVisualAndUp dateSTC()
в System.Windows.Window.SetupInitialState( Double requestedTop, Double requestedLeft, Double requestedWidth, Double requestedHeight)
в System.Windows.Window.CreateSourceWindow (Boolean duringShow)
в System.Windows.Window.ShowHelper(Object booleanBox)
в System.Windows.Threading.ExceptionWrappe r.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
в MS.Internal.Threading.ExceptionFilterHel per.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
в System.Windows.Threading.DispatcherOpera tion.InvokeImpl()
в System.Threading.ExecutionContext.RunInt ernal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
в System.Threading.ExecutionContext.Run(Ex ecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
в System.Threading.ExecutionContext.Run(Ex ecutionContext executionContext, ContextCallback callback, Object state)
в System.Windows.Threading.DispatcherOpera tion.Invoke()
в System.Windows.Threading.Dispatcher.Proc essQueue()
в System.Windows.Threading.Dispatcher.WndP rocHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
в MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
в MS.Win32.HwndSubclass.DispatcherCallback Operation(Object o)
в System.Windows.Threading.ExceptionWrappe r.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
в MS.Internal.Threading.ExceptionFilterHel per.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
в System.Windows.Threading.Dispatcher.Lega cyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
в MS.Win32.HwndSubclass.SubclassWndProc(In tPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
в MS.Win32.UnsafeNativeMethods.DispatchMes sage(MSG& msg)
в System.Windows.Threading.Dispatcher.Push FrameImpl(DispatcherFrame frame)
в System.Windows.Application.RunInternal(W indow window)
в System.Windows.Application.Run()
в Test.App.Main() в c:\Users\Michael\Desktop\Test\Test\obj\D ebug\App.g.cs:строка 0
в System.AppDomain._nExecuteAssembly(Runti meAssembly assembly, String[] args)
в Microsoft.VisualStudio.HostingProcess.Ho stProc.RunUsersAssembly()
в System.Threading.ExecutionContext.RunInt ernal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
в System.Threading.ExecutionContext.Run(Ex ecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
в System.Threading.ExecutionContext.Run(Ex ecutionContext executionContext, ContextCallback callback, Object state)
в System.Threading.ThreadHelper.ThreadStar t()
InnerException: