For all of who use Randy Drisgill’s starter masters, it won’t help if you go to Site Actions TreView and just enable it, because the DelegateControl is in a hidden panel. To really restore the original treeview you have to copy this xml from v4.master: <Sharepoint:UIVersionedContent runat="server" UIVersion="4"> <ContentTemplate> <Sharepoint:SPNavigationManager id="TreeViewNavigationManagerV4" runat="server" ContainedControl="TreeView" CssClass="s4-treeView" > <SharePoint:SPLinkButton runat="server" NavigateUrl="~site/\_layouts/viewlsts.aspx" id="idNavLinkSiteHierarchyV4" Text="<%$Resources:wss,treeview\_header%>" accesskey="<%$Resources:wss,quiklnch\_allcontent\_AK%>" CssClass="s4-qlheader" /> <div class="ms-treeviewouter"> <SharePoint:DelegateControl runat="server" ControlId="TreeViewAndDataSource"> <Template\_Controls> <SharePoint:SPHierarchyDataSourceControl runat="server" id="TreeViewDataSourceV4" RootContextObject="Web" IncludeDiscussionFolders="true" /> <SharePoint:SPRememberScroll runat="server" id="TreeViewRememberScrollV4" onscroll="javascript:_spRecordScrollPositions(this);" style="overflow: auto;height: 400px;width: 155px; "> <Sharepoint:SPTreeView id="WebTreeViewV4" runat="server" ShowLines="false" DataSourceId="TreeViewDataSourceV4" ExpandDepth="0" SelectedNodeStyle-CssClass="ms-tvselected" NodeStyle-CssClass="ms-navitem" SkipLinkText="" NodeIndent="12" ExpandImageUrl="/_layouts/images/tvclosed.