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diff --git a/src/sidebar/common.vala b/src/sidebar/common.vala
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+/* Copyright 2011-2014 Yorba Foundation
+ *
+ * This software is licensed under the GNU Lesser General Public License
+ * (version 2.1 or later).  See the COPYING file in this distribution.
+ */
+
+// A simple grouping Entry that is only expandable
+public class Sidebar.Grouping : Object, Sidebar.Entry, Sidebar.ExpandableEntry {
+    private string name;
+    private Icon? open_icon;
+    private Icon? closed_icon;
+    
+    public Grouping(string name, Icon? open_icon, Icon? closed_icon = null) {
+        this.name = name;
+        this.open_icon = open_icon;
+        this.closed_icon = closed_icon ?? open_icon;
+    }
+    
+    public string get_sidebar_name() {
+        return name;
+    }
+    
+    public string? get_sidebar_tooltip() {
+        return name;
+    }
+    
+    public Icon? get_sidebar_icon() {
+        return null;
+    }
+    
+    public Icon? get_sidebar_open_icon() {
+        return open_icon;
+    }
+    
+    public Icon? get_sidebar_closed_icon() {
+        return closed_icon;
+    }
+    
+    public string to_string() {
+        return name;
+    }
+    
+    public bool expand_on_select() {
+        return true;
+    }
+}
+
+// An end-node on the sidebar that represents a Page with its page context menu.  Additional 
+// interfaces can be added if additional functionality is required (such as a drop target).
+// This class also handles the bookwork of creating the Page on-demand and maintaining it in memory.
+public abstract class Sidebar.SimplePageEntry : Object, Sidebar.Entry, Sidebar.SelectableEntry,
+    Sidebar.PageRepresentative, Sidebar.Contextable {
+    private Page? page = null;
+    
+    public SimplePageEntry() {
+    }
+    
+    public abstract string get_sidebar_name();
+    
+    public virtual string? get_sidebar_tooltip() {
+        return get_sidebar_name();
+    }
+    
+    public abstract Icon? get_sidebar_icon();
+    
+    public virtual string to_string() {
+        return get_sidebar_name();
+    }
+    
+    protected abstract Page create_page();
+    
+    public bool has_page() {
+        return page != null;
+    }
+    
+    protected Page get_page() {
+        if (page == null) {
+            page = create_page();
+            page_created(page);
+        }
+        
+        return page;
+    }
+    
+    internal void pruned(Sidebar.Tree tree) {
+        if (page == null)
+            return;
+        
+        destroying_page(page);
+        page.destroy();
+        page = null;
+    }
+    
+    public Gtk.Menu? get_sidebar_context_menu(Gdk.EventButton? event) {
+        return get_page().get_page_context_menu();
+    }
+}
+
+// A simple Sidebar.Branch where the root node is the branch in entirety.
+public class Sidebar.RootOnlyBranch : Sidebar.Branch {
+    public RootOnlyBranch(Sidebar.Entry root) {
+        base (root, Sidebar.Branch.Options.NONE, null_comparator);
+    }
+    
+    private static int null_comparator(Sidebar.Entry a, Sidebar.Entry b) {
+        return (a != b) ? -1 : 0;
+    }
+}
+
+public interface Sidebar.Contextable : Object {
+    // Return null if the context menu should not be invoked for this event
+    public abstract Gtk.Menu? get_sidebar_context_menu(Gdk.EventButton? event);
+}
+