System.ArgumentOutOfRangeException: Индекс за пределами диапазона. Индекс должен быть положительным числом, а его размер не должен превышать размер коллекции.
Имя параметра: index
    в System.ThrowHelper.ThrowArgumentOutOfRangeException()
    в LFStudio.MainWindow.FilllbsImages(List`1 lfd, Int32 nproj)
    в LFStudio.MainWindow.DockManager_ActiveDocumentChanged(Object sender, EventArgs e)
    в AvalonDock.DockingManager.OnActiveDocumentChanged(DependencyPropertyChangedEventArgs e)
    в AvalonDock.DockingManager.OnActiveDocumentChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    в System.Windows.DependencyObject.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
    в System.Windows.FrameworkElement.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
    в AvalonDock.DockingManager.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
    в System.Windows.DependencyObject.NotifyPropertyChange(DependencyPropertyChangedEventArgs args)
    в System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType)
    в System.Windows.DependencyObject.SetValueCommon(DependencyProperty dp, Object value, PropertyMetadata metadata, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType, Boolean isInternal)
    в System.Windows.DependencyObject.SetValue(DependencyProperty dp, Object value)
    в AvalonDock.DocumentPane.OnSelectionChanged(SelectionChangedEventArgs e)
    в System.Windows.Controls.Primitives.Selector.InvokeSelectionChanged(List`1 unselectedItems, List`1 selectedItems)
    в System.Windows.Controls.Primitives.Selector.SelectionChanger.End()
    в System.Windows.Controls.Primitives.Selector.SelectionChanger.SelectJustThisItem(Object item, Boolean assumeInItemsCollection)
    в System.Windows.Controls.Primitives.Selector.OnSelectedItemChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    в System.Windows.DependencyObject.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
    в System.Windows.FrameworkElement.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
    в System.Windows.DependencyObject.NotifyPropertyChange(DependencyPropertyChangedEventArgs args)
    в System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType)
    в System.Windows.DependencyObject.SetValueCommon(DependencyProperty dp, Object value, PropertyMetadata metadata, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType, Boolean isInternal)
    в System.Windows.DependencyObject.SetValue(DependencyProperty dp, Object value)
    в AvalonDock.ManagedContent.Activate()
    в AvalonDock.DocumentContent.Activate()
    в AvalonDock.ManagedContent.OnMouseDown(MouseButtonEventArgs e)
    в System.Windows.UIElement.OnMouseDownThunk(Object sender, MouseButtonEventArgs e)
    в System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)
    в System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
    в System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
    в System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
    в System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
    в System.Windows.UIElement.RaiseTrustedEvent(RoutedEventArgs args)
    в System.Windows.UIElement.RaiseEvent(RoutedEventArgs args, Boolean trusted)
    в System.Windows.Input.InputManager.ProcessStagingArea()
    в System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
    в System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport)
    в System.Windows.Interop.HwndMouseInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawMouseActions actions, Int32 x, Int32 y, Int32 wheel)
    в System.Windows.Interop.HwndMouseInputProvider.FilterMessage(IntPtr hwnd, WindowMessage msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
    в System.Windows.Interop.HwndSource.InputFilterMessage(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.DispatcherCallbackOperation(Object o)
    в System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
    в MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
    в System.Windows.Threading.Dispatcher.InvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
    в MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
    в MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
    в System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
    в System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)
    в System.Windows.Application.RunDispatcher(Object ignore)
    в System.Windows.Application.RunInternal(Window window)
    в System.Windows.Application.Run(Window window)
    в LFStudio.App.Main()