diff --git a/chrome/chromeFiles/content/scholar/itemTreeView.js b/chrome/chromeFiles/content/scholar/itemTreeView.js
index e4fbeb65f6..17d31df99b 100644
--- a/chrome/chromeFiles/content/scholar/itemTreeView.js
+++ b/chrome/chromeFiles/content/scholar/itemTreeView.js
@@ -6,7 +6,7 @@ Scholar.ItemTreeView = function(itemGroup)
 	this._itemGroup = itemGroup;
 	this.refresh();
 	
-//	this._unregisterID = Scholar.registerItemTree(this);
+	this._unregisterID = Scholar.Notifier.registerItemTree(this);
 }
 
 Scholar.ItemTreeView.prototype.refresh = function()
@@ -23,7 +23,7 @@ Scholar.ItemTreeView.prototype.refresh = function()
 
 Scholar.ItemTreeView.prototype.unregister = function()
 {
-	Scholar.unregisterItemTree(this._unregisterID);
+	Scholar.Notifier.unregisterItemTree(this._unregisterID);
 }
 
 Scholar.ItemTreeView.prototype.setTree = function(treebox)
@@ -172,7 +172,7 @@ Scholar.ItemTreeView.prototype.notify = function(action, type, id)
 	{
 		var item = Scholar.Items.get(id);
 		
-		if(this._itemGroup.isLibrary() || item.hasParent(this.getCollectionID()))
+		if(this._itemGroup.isLibrary() || item.inCollection(this.getCollectionID()))
 		{
 			this._showItem(item,this.rowCount);
 			this._treebox.rowCountChanged(this.rowCount,1);
diff --git a/chrome/chromeFiles/content/scholar/xpcom/data_access.js b/chrome/chromeFiles/content/scholar/xpcom/data_access.js
index 77c400bbd1..99ca0dc03b 100644
--- a/chrome/chromeFiles/content/scholar/xpcom/data_access.js
+++ b/chrome/chromeFiles/content/scholar/xpcom/data_access.js
@@ -150,6 +150,16 @@ Scholar.Item.prototype.getCollections = function(){
 }
 
 
+/**
+* Determine whether the item belongs to a given collectionID
+**/
+Scholar.Item.prototype.inCollection = function(collectionID){
+	return !!parseInt(Scholar.DB.valueQuery("SELECT COUNT(*) collectionID "
+		+ "FROM collectionItems WHERE collectionID=" + collectionID + " AND "
+		+ "itemID=" + this.getID()));
+}
+
+
 /*
  * Returns the number of creators for this item
  */
@@ -839,8 +849,6 @@ Scholar.Items = new function(){
 		var obj = this.get(id);
 		obj.erase(); // calls unload()
 		obj = undefined;
-		
-		// TODO: trigger reload of treeview
 	}
 	
 	
@@ -976,8 +984,11 @@ Scholar.Collection.prototype.addItem = function(itemID){
 	
 	this._childItems.set(itemID);
 	this._hasChildItems = true;
+	
+	Scholar.Notifier.trigger('add', 'item', itemID);
 }
 
+
 Scholar.Collection.prototype.removeItem = function(itemID){
 	Scholar.DB.beginTransaction();
 	
@@ -1009,6 +1020,8 @@ Scholar.Collection.prototype.removeItem = function(itemID){
 	if (!this._childItems.length){
 		this._hasChildItems = false;
 	}
+	
+	Scholar.Notifier.trigger('remove', 'item', itemID);
 }
 
 
diff --git a/chrome/chromeFiles/content/scholar/xpcom/notifier.js b/chrome/chromeFiles/content/scholar/xpcom/notifier.js
new file mode 100644
index 0000000000..a7e6dd5114
--- /dev/null
+++ b/chrome/chromeFiles/content/scholar/xpcom/notifier.js
@@ -0,0 +1,76 @@
+Scholar.Notifier = new function(){
+	var _observers = new Array();
+	_observers['columnTree'] = new Array();
+	_observers['itemTree'] = new Array();
+	
+	this.registerColumnTree = registerColumnTree;
+	this.registerItemTree = registerItemTree;
+	this.unregisterColumnTree = unregisterColumnTree;
+	this.unregisterItemTree = unregisterItemTree;
+	this.trigger = trigger;
+	
+	function registerColumnTree(ref){
+		_register('columnTree', ref);
+	}
+	
+	function registerItemTree(ref){
+		_register('itemTree', ref);
+	}
+	
+	function unregisterColumnTree(hash){
+		_unregister('columnTree', hash);
+	}
+	
+	function unregisterItemTree(hash){
+		_unregister('columnTree', hash);
+	}
+	
+	/**
+	* event is one of 'add', 'remove', 'modify'
+	* type is one of 'collection', 'smartcollection', 'item'
+	**/
+	function trigger(event, type, id){
+		switch (type){
+			case 'item':
+				var treeType = 'itemTree';
+				break;
+			case 'collection':
+			case 'smartcollection':
+				var treeType = 'columnTree';
+				break;
+			default:
+				throw('Invalid type in Notifier.trigger()');
+		}
+		
+		for (i in _observers[treeType]){
+			Scholar.debug("Calling _observers['" + treeType + "']['" + i + "'].notify('" + event
+				+ "', " + type + "', " + id + ")", 4);
+			_observers[treeType][i].notify(event, type, id);
+		}
+	}
+	
+	
+	function _register(type, ref){
+		var len = 6;
+		var tries = 10;
+		do {
+			// Increase the hash length if we can't find a unique key
+			if (!tries){
+				len++;
+				tries = 10;
+			}
+			
+			var hash = Scholar.randomString(len);
+			tries--;
+		}
+		while (_observers[type][hash]);
+		
+		Scholar.debug('Registering ' + type + " with hash '" + hash + "'", 4);
+		_observers[type][hash] = ref;
+		return hash;
+	}
+	
+	function _unregister(type, hash){
+		delete _observers[type][hash];
+	}
+}
diff --git a/components/chnmIScholarService.js b/components/chnmIScholarService.js
index 6556ae88fa..5cf65fb7c1 100644
--- a/components/chnmIScholarService.js
+++ b/components/chnmIScholarService.js
@@ -27,6 +27,10 @@ Cc["@mozilla.org/moz/jssubscript-loader;1"]
 	.getService(Ci.mozIJSSubScriptLoader)
 	.loadSubScript("chrome://scholar/content/xpcom/data_access.js");
 
+Cc["@mozilla.org/moz/jssubscript-loader;1"]
+	.getService(Ci.mozIJSSubScriptLoader)
+	.loadSubScript("chrome://scholar/content/xpcom/notifier.js");
+
 /********************************************************************/