private void InternalRemove(DockPane pane)
        {
            if (!Contains(pane))
            {
                return;
            }

            NestedDockingStatus statusPane     = pane.NestedDockingStatus;
            DockPane            lastNestedPane = null;

            for (int i = Count - 1; i > IndexOf(pane); i--)
            {
                if (this[i].NestedDockingStatus.PreviousPane == pane)
                {
                    lastNestedPane = this[i];
                    break;
                }
            }

            if (lastNestedPane != null)
            {
                int indexLastNestedPane = IndexOf(lastNestedPane);
                Items.Remove(lastNestedPane);
                Items[IndexOf(pane)] = lastNestedPane;
                NestedDockingStatus lastNestedDock = lastNestedPane.NestedDockingStatus;
                lastNestedDock.SetStatus(this, statusPane.PreviousPane, statusPane.Alignment, statusPane.Proportion);
                for (int i = indexLastNestedPane - 1; i > IndexOf(lastNestedPane); i--)
                {
                    NestedDockingStatus status = this[i].NestedDockingStatus;
                    if (status.PreviousPane == pane)
                    {
                        status.SetStatus(this, lastNestedPane, status.Alignment, status.Proportion);
                    }
                }
            }
            else
            {
                Items.Remove(pane);
            }

            statusPane.SetStatus(null, null, DockAlignment.Left, 0.5);
            statusPane.SetDisplayingStatus(false, null, DockAlignment.Left, 0.5);
            statusPane.SetDisplayingBounds(Rectangle.Empty, Rectangle.Empty, Rectangle.Empty);
        }
        private void CalculateBounds()
        {
            if (Count == 0)
            {
                return;
            }

            this[0].NestedDockingStatus.SetDisplayingBounds(Container.DisplayingRectangle, Container.DisplayingRectangle, Rectangle.Empty);

            for (int i = 1; i < Count; i++)
            {
                DockPane            pane       = this[i];
                NestedDockingStatus status     = pane.NestedDockingStatus;
                DockPane            prevPane   = status.DisplayingPreviousPane;
                NestedDockingStatus statusPrev = prevPane.NestedDockingStatus;

                Rectangle rect = statusPrev.PaneBounds;
                bool      bVerticalSplitter = (status.DisplayingAlignment == DockAlignment.Left || status.DisplayingAlignment == DockAlignment.Right);

                Rectangle rectThis     = rect;
                Rectangle rectPrev     = rect;
                Rectangle rectSplitter = rect;
                if (status.DisplayingAlignment == DockAlignment.Left)
                {
                    rectThis.Width     = (int)((double)rect.Width * status.DisplayingProportion) - (Measures.SplitterSize / 2);
                    rectSplitter.X     = rectThis.X + rectThis.Width;
                    rectSplitter.Width = Measures.SplitterSize;
                    rectPrev.X         = rectSplitter.X + rectSplitter.Width;
                    rectPrev.Width     = rect.Width - rectThis.Width - rectSplitter.Width;
                }
                else if (status.DisplayingAlignment == DockAlignment.Right)
                {
                    rectPrev.Width     = (rect.Width - (int)((double)rect.Width * status.DisplayingProportion)) - (Measures.SplitterSize / 2);
                    rectSplitter.X     = rectPrev.X + rectPrev.Width;
                    rectSplitter.Width = Measures.SplitterSize;
                    rectThis.X         = rectSplitter.X + rectSplitter.Width;
                    rectThis.Width     = rect.Width - rectPrev.Width - rectSplitter.Width;
                }
                else if (status.DisplayingAlignment == DockAlignment.Top)
                {
                    rectThis.Height     = (int)((double)rect.Height * status.DisplayingProportion) - (Measures.SplitterSize / 2);
                    rectSplitter.Y      = rectThis.Y + rectThis.Height;
                    rectSplitter.Height = Measures.SplitterSize;
                    rectPrev.Y          = rectSplitter.Y + rectSplitter.Height;
                    rectPrev.Height     = rect.Height - rectThis.Height - rectSplitter.Height;
                }
                else if (status.DisplayingAlignment == DockAlignment.Bottom)
                {
                    rectPrev.Height     = (rect.Height - (int)((double)rect.Height * status.DisplayingProportion)) - (Measures.SplitterSize / 2);
                    rectSplitter.Y      = rectPrev.Y + rectPrev.Height;
                    rectSplitter.Height = Measures.SplitterSize;
                    rectThis.Y          = rectSplitter.Y + rectSplitter.Height;
                    rectThis.Height     = rect.Height - rectPrev.Height - rectSplitter.Height;
                }
                else
                {
                    rectThis = Rectangle.Empty;
                }

                rectSplitter.Intersect(rect);
                rectThis.Intersect(rect);
                rectPrev.Intersect(rect);
                status.SetDisplayingBounds(rect, rectThis, rectSplitter);
                statusPrev.SetDisplayingBounds(statusPrev.LogicalBounds, rectPrev, statusPrev.SplitterBounds);
            }
        }