You can use SiteMenu control (\Sitefinity\UserControls\Navigation35\SiteMenu.ascx.cs) and its StartingNodeUrl to select a page. The menu will be populated with all child pages of the specified node.Gets or sets an URL of starting node that determines the root hierarchy that is exposed by the data source control. You can implement this property in each control that is populated from the site map. There is a buil-in selector for dynamic links - Telerik.Cms.Web.UI.DhlUrlEditor
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