By default, the Visible property is True. Use the Visible property to hide an element. Use the Remove method to remove an element. If the element is child of another element ( Parent property specifies the element's parent ), the element is visible, if all parents are visible and expanded. The Expanded property specifies whether an element is expanded or collapsed. If the element is not visible, any incoming or outgoing links are not visible as well. The OutgoingLinks property specifies the list of links that starts from the current element. The IncomingLinks property specifies the list of links that ends on the current element.