Clears the current child controls collection, and rebuilds it by calling the SiteMapPath.CreateControlHierarchy method.
This method is called by the ASP.NET infrastructure to notify any controls that use composition-based implementation, including controls that derive from System.Web.UI.WebControls.CompositeDataBoundControl and System.Web.UI.WebControls.CompositeControl to create any child controls they contain in preparation for postback or rendering.