Here is a sample that illustrates how to get the current item and then the root item of your RadMenu control
CmsSiteMapNode currentNode = SiteMap.CurrentNode
&& currentNode.ParentNode !=
(currentNode.ParentNode != SiteMap.RootNode)
currentNode = (CmsSiteMapNode)currentNode.ParentNode;
RadMenuItem menuItem =
// here menuItem is the root item.
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