diff --git a/lib/timeline/Graph2d.js b/lib/timeline/Graph2d.js
index c4354df2..b94b9522 100644
--- a/lib/timeline/Graph2d.js
+++ b/lib/timeline/Graph2d.js
@@ -27,7 +27,7 @@ var configureOptions = require('./optionsGraph2d').configureOptions;
  */
 function Graph2d (container, items, groups, options) {
   // if the third element is options, the forth is groups (optionally);
-  if (!(Array.isArray(groups) || groups instanceof DataSet) && groups instanceof Object) {
+  if (!(Array.isArray(groups) || groups instanceof DataSet || groups instanceof DataView) && groups instanceof Object) {
     var forthArgument = options;
     options = groups;
     groups = forthArgument;
diff --git a/lib/timeline/component/LineGraph.js b/lib/timeline/component/LineGraph.js
index 23e82e9e..452d3385 100644
--- a/lib/timeline/component/LineGraph.js
+++ b/lib/timeline/component/LineGraph.js
@@ -307,8 +307,6 @@ LineGraph.prototype.setItems = function(items) {
     ids = this.itemsData.getIds();
     this._onAdd(ids);
   }
-  this._updateUngrouped();
-  //this._updateGraph();
   this.redraw(true);
 };
 
@@ -365,9 +363,7 @@ LineGraph.prototype.setGroups = function(groups) {
  * @private
  */
 LineGraph.prototype._onUpdate = function(ids) {
-  this._updateUngrouped();
   this._updateAllGroupData();
-  //this._updateGraph();
   this.redraw(true);
 };
 LineGraph.prototype._onAdd          = function (ids) {this._onUpdate(ids);};
@@ -377,8 +373,6 @@ LineGraph.prototype._onUpdateGroups  = function (groupIds) {
     var group = this.groupsData.get(groupIds[i]);
     this._updateGroup(group, groupIds[i]);
   }
-
-  //this._updateGraph();
   this.redraw(true);
 };
 LineGraph.prototype._onAddGroups = function (groupIds) {this._onUpdateGroups(groupIds);};
@@ -405,8 +399,6 @@ LineGraph.prototype._onRemoveGroups = function (groupIds) {
       delete this.groups[groupIds[i]];
     }
   }
-  this._updateUngrouped();
-  //this._updateGraph();
   this.redraw(true);
 };
 
@@ -454,81 +446,40 @@ LineGraph.prototype._updateGroup = function (group, groupId) {
 LineGraph.prototype._updateAllGroupData = function () {
   if (this.itemsData != null) {
     var groupsContent = {};
-    var groupId;
-    for (groupId in this.groups) {
-      if (this.groups.hasOwnProperty(groupId)) {
-        groupsContent[groupId] = [];
-      }
-    }
-    for (var itemId in this.itemsData._data) {
-      if (this.itemsData._data.hasOwnProperty(itemId)) {
-        var item = this.itemsData._data[itemId];
-        if (groupsContent[item.group] === undefined) {
-          throw new Error('Cannot find referenced group ' + item.group + '. Possible reason: items added before groups? Groups need to be added before items, as items refer to groups.')
-        }
-        item.x = util.convert(item.x,'Date');
-        groupsContent[item.group].push(item);
+    this.itemsData.get().forEach(function(item){
+      var groupId = item.group;
+      if (groupId === null || groupId === undefined) {
+        groupId = UNGROUPED;
       }
-    }
-    for (groupId in this.groups) {
-      if (this.groups.hasOwnProperty(groupId)) {
-        this.groups[groupId].setItems(groupsContent[groupId]);
+      if (groupsContent[groupId] === undefined) {
+        groupsContent[groupId] = [];
       }
-    }
-  }
-};
-
-
-/**
- * Create or delete the group holding all ungrouped items. This group is used when
- * there are no groups specified. This anonymous group is called 'graph'.
- * @protected
- */
-LineGraph.prototype._updateUngrouped = function() {
-  if (this.itemsData && this.itemsData != null) {
-    var ungroupedCounter = 0;
-    for (var itemId in this.itemsData._data) {
-      if (this.itemsData._data.hasOwnProperty(itemId)) {
-        var item = this.itemsData._data[itemId];
-        if (item != undefined) {
-          if (item.hasOwnProperty('group')) {
-            if (item.group === undefined) {
-              item.group = UNGROUPED;
-            }
+      var extended = Object.create(item);
+      extended.x = util.convert(item.x, 'Date');
+      groupsContent[groupId].push(extended);
+    });
+    //Update legendas and axis
+    for (var groupId in groupsContent) {
+      if (groupsContent.hasOwnProperty(groupId)) {
+        if (groupsContent[groupId].length == 0) {
+          if (this.groups.hasOwnProperty(groupId)) {
+            this._onRemoveGroups([groupId]);
           }
-          else {
-            item.group = UNGROUPED;
+        } else {
+          if (!this.groups.hasOwnProperty(groupId)) {
+            var group = {id: groupId, content: this.options.defaultGroup};
+            if (this.groupsData && this.groupsData.hasOwnProperty(groupId)) {
+              group = this.groupsData[groupId];
+            }
+            this._updateGroup(group, groupId);
           }
-          ungroupedCounter = item.group == UNGROUPED ? ungroupedCounter + 1 : ungroupedCounter;
+          this.groups[groupId].setItems(groupsContent[groupId]);
         }
       }
     }
-
-    if (ungroupedCounter == 0) {
-      delete this.groups[UNGROUPED];
-      this.legendLeft.removeGroup(UNGROUPED);
-      this.legendRight.removeGroup(UNGROUPED);
-      this.yAxisLeft.removeGroup(UNGROUPED);
-      this.yAxisRight.removeGroup(UNGROUPED);
-    }
-    else {
-      var group = {id: UNGROUPED, content: this.options.defaultGroup};
-      this._updateGroup(group, UNGROUPED);
-    }
-  }
-  else {
-    delete this.groups[UNGROUPED];
-    this.legendLeft.removeGroup(UNGROUPED);
-    this.legendRight.removeGroup(UNGROUPED);
-    this.yAxisLeft.removeGroup(UNGROUPED);
-    this.yAxisRight.removeGroup(UNGROUPED);
   }
-
-  this.legendLeft.redraw();
-  this.legendRight.redraw();
 };
 
-
 /**
  * Redraw the component, mandatory function
  * @return {boolean} Returns true if the component is resized