Creating Multi-tier Navigation with the CombinedNavSiteMapProvider
The CombinedNavSiteMapProvider was initially introduced in SharePoint Server 2007, which included a master page named BlueTabs.master. The BlueTabs.master page used the CombinedNavSiteMapProvider by default, which also provided an additional tier of navigation in the top-level navigation (see Figure 17.119.)
Figure 17.119 The BlueTabs.master page shown in SharePoint Server 2007 includes the CombinedNavSiteMapProvider.
By using the same concept as in BlueTabs.master, you can adapt the CombinedNavSiteMapProvider to add two tiers of menu items into SharePoint Server 2010 sites.
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