protected internal virtual Size ArrangeOverride(NonVirtualizingLayoutContext context, Size finalSize)
 {
     throw new NotImplementedException();
 }
 public LayoutContextAdapter(NonVirtualizingLayoutContext nonVirtualizingContext)
 {
     m_nonVirtualizingContext = new WeakReference <NonVirtualizingLayoutContext>(nonVirtualizingContext);
 }
 protected internal virtual Size MeasureOverride(NonVirtualizingLayoutContext context, Size availableSize)
 {
     throw new NotImplementedException();
 }