FlatRedBall.Gui.CollapseItem.MoveLeftOne C# (CSharp) Method

        public void MoveLeftOne()
        {
            if (parentItem != null)
            {
                parentItem.mItems.Remove(this);
                parentItem = parentItem.parentItem;

                if (parentItem != null)
                    parentItem.AttachItemToThis(this);
                else
                {
                    if (null != mParentBox as ListBoxBase)
                        ((ListBoxBase)mParentBox).mItems.Add(this);
                }
            }
        }

 public CollapseItem MoveLeftOne(CollapseItem itemToRemove)
 {
     if (itemToRemove != null)
     {
         itemToRemove.MoveLeftOne();
     }
     return(itemToRemove);
 }