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The Menu control is another rich control that supports hierarchical data. Like the TreeView, you can bind the Menu control to a data source, or you can fill it by hand using MenuItem objects.
To try the Menu control, remove the TreeView from your master page, and add the following Menu control tag:
<asp:Menu ID="Menu1" runat="server" DataSourceID="SiteMapDataSource1" />
Notice that this doesn't configure any properties—it uses the default appearance. The only step you need to perform is setting the DataSourceID property to link the menu to the site map information.
When the Menu first appears, you'll see only the starting node, with an arrow next to it. When you move your mouse over the starting node, the next level of ...