Forgot to add the sidebar.js file before. :-)

chrome/chromeFiles/content/scholar/sidebar.js

@@ -0,0 +1,21 @@
+var treeView = {
+    rowCount : 100,
+    getCellText : function(row,column){
+      if (column.id == "title_column") return "Row "+row;
+      else return "February 18";
+    },
+    setTree: function(treebox){ this.treebox = treebox; },
+    isContainer: function(row){ return false; },
+    isSeparator: function(row){ return false; },
+    isSorted: function(){ return false; },
+    getLevel: function(row){ return 0; },
+    getImageSrc: function(row,col){ return null; },
+    getRowProperties: function(row,props){},
+    getCellProperties: function(row,col,props){},
+    getColumnProperties: function(colid,col,props){}
+};
+
+function setView()
+{
+    document.getElementById('scholar-sidebar-items').view=treeView;
+}