/// <summary>
/// Unsubscribe from blocks events
/// </summary>
private void UnsubscribeBlock(Block block)
{
ContainerBlock oldParent = block.Parent;
block.KeyDown -= RaiseKeyDown;
block.Prev = null;
block.Next = null;
block.Root = null;
block.MyControl.Root = null;
block.Parent = null;
block.MyControl.Parent = null;
block.NotifyParentChanged(oldParent);
block.OnAfterDelete();
}
