private static void HandleItemLeftMouseUp(object sender, MouseButtonEventArgs eventArgs)
        {
            eventArgs.Handled = false;
            if (eventArgs.OriginalSource is TextBox)
            {
                ListBoxItem textBoxParentItem;
                ListBox     textBoxParentItemsControl;
                if (TextBoxFocusAttachedBehavior.TryFindAttachedElementsParentItem(
                        eventArgs.OriginalSource as DependencyObject,
                        out textBoxParentItem) &&
                    TextBoxFocusAttachedBehavior.TryFindAttachedElementsParentItemsControl(
                        eventArgs.OriginalSource as DependencyObject,
                        out textBoxParentItemsControl))
                {
                    textBoxParentItemsControl.SelectedItem = textBoxParentItem.Content;
                }

                return;
            }

            // Apply behavior when ListBoxItem is clicked anywhere else but Buttons, Checkboxes, etc
            if (eventArgs.OriginalSource is Border)
            {
                var     parentItem = sender as ListBoxItem;
                TextBox textBox    = TextBoxFocusAttachedBehavior.GetParentItemTextBox(parentItem);

                TextBoxFocusAttachedBehavior.ApplyBehaviors(textBox);
            }
        }
        /// <summary>
        /// Listen to the parent ListBoxItem's PreviewMouseLeftButtonUp to handle focus behavior. <para/>
        /// Using the Selected event or in general the default ListBox selection mechanism  <para/>
        /// would interfere with other user input (e.g. opening context menu, which involves  <para/>
        /// the corresponding item to be selected. So stealing the focus in such case leads to odd behavior.)
        /// </summary>
        /// <param name="attachingElement"></param>
        /// <param name="isEnabled"></param>
        private static void ObserveAttachedElement(DependencyObject attachingElement, bool isEnabled)
        {
            ListBox itemsControl;

            if (TextBoxFocusAttachedBehavior.TryFindAttachedElementsParentItemsControl(attachingElement, out itemsControl))
            {
                ListBoxItem item;
                if (TextBoxFocusAttachedBehavior.TryFindAttachedElementsParentItem(attachingElement, out item))
                {
                    if (isEnabled)
                    {
                        // Ensure to listen to event with only one handler assigned each ItemsControl
                        if (!TextBoxFocusAttachedBehavior.GetAttachedElementIsRegistered(itemsControl))
                        {
                            //LogDocumentKeyboardInputHandler.Navigated += TextBoxFocusAttachedBehavior.HandleFocusOnKeyboardNavigated;
                        }

                        // Store the item's attached TextBox for later use with the event handlers
                        TextBoxFocusAttachedBehavior.SetParentItemTextBox(item, attachingElement as TextBox);


                        WeakEventManager <UIElement, MouseButtonEventArgs> .AddHandler(
                            item,
                            "PreviewMouseLeftButtonUp",
                            TextBoxFocusAttachedBehavior.HandleItemLeftMouseUp);

                        TextBoxFocusAttachedBehavior.SetAttachedElementIsRegistered(item, true);
                    }
                    else
                    {
                        //LogDocumentKeyboardInputHandler.Navigated -= TextBoxFocusAttachedBehavior.HandleFocusOnKeyboardNavigated;

                        // Release the attached TextBox
                        TextBoxFocusAttachedBehavior.SetParentItemTextBox(item, null);

                        WeakEventManager <UIElement, MouseButtonEventArgs> .RemoveHandler(
                            item,
                            "PreviewMouseLeftButtonUp",
                            TextBoxFocusAttachedBehavior.HandleItemLeftMouseUp);

                        TextBoxFocusAttachedBehavior.SetAttachedElementIsRegistered(item, false);
                    }
                }
            }
        }