diff --git a/modoboa/extensions/stats/__init__.py b/modoboa/extensions/stats/__init__.py
index e58bd43c2..808bc2a40 100644
--- a/modoboa/extensions/stats/__init__.py
+++ b/modoboa/extensions/stats/__init__.py
@@ -21,6 +21,8 @@ class Stats(ModoExtension):
     needs_media = True
 
     def load(self):
+        events.registerEvent("GetGraphSets")
+
         parameters.register_admin("LOGFILE", type="string", 
                                   deflt="/var/log/mail.log",
                                   help=ugettext_lazy("Path to log file used to collect statistics"))
@@ -45,3 +47,10 @@ def menu(target, user):
          "label" : _("Statistics"),
          "url" : reverse('fullindex')}
         ]
+
+@events.observe("GetGraphSets")
+def get_default_graph_sets():
+    from graph_templates import MailTraffic
+
+    gset = MailTraffic()
+    return {gset.html_id: gset}
diff --git a/modoboa/extensions/stats/graph_templates.py b/modoboa/extensions/stats/graph_templates.py
index ce629c822..5350a4c0d 100644
--- a/modoboa/extensions/stats/graph_templates.py
+++ b/modoboa/extensions/stats/graph_templates.py
@@ -2,50 +2,73 @@
 
 from django.utils.translation import ugettext_lazy
 
-class MailTrafic(object):
-    pass
+class Graph(object):
+    width = 540
+    height = 120
+    cf = 'AVERAGE'
 
-traffic_avg_template = {
-    'name' : 'traffic',
-    'title' : ugettext_lazy("Average normal traffic"),
-    'width'  : '540',
-    'height' : '120',
-    'vertlabel' : ugettext_lazy('msgs/min'),
-    'cf' : 'AVERAGE',
-    'vars' : {
-        'sent' : { "type" : "AREA", "color" : "#00FF00", 
-                   "legend" : ugettext_lazy("sent messages") },
-        'recv' : { "type" : "AREA", "color" : "#0000FF", 
-                   "legend" : ugettext_lazy("received messages") },
-        }
-}
+    def __init__(self, **ds):
+        self.vars = {}
+        for dsname, dsdef in ds.iteritems():
+            self.vars[dsname] = dsdef
 
-badtraffic_avg_template = {
-    'name' : 'badtraffic',
-    'title' : ugettext_lazy("Average bad traffic"),
-    'width'  : '540',
-    'height' : '120',
-    'vertlabel' : ugettext_lazy('msgs/min'),
-    'cf' : 'AVERAGE',
-    'vars' : {
-        'bounced' : { "type" : "AREA", "color" : "#FFFF00", 
-                      "legend" : ugettext_lazy("bounced messages") },
-        'reject' : { "type" : "AREA", "color" : "#FF0000", 
-                     "legend" : ugettext_lazy("rejected messages") },
-        }
-}
+    @property
+    def display_name(self):
+        return self.__class__.__name__.lower()
 
-size_avg_template = {
-    'name' : 'size',
-    'title' : ugettext_lazy("Average normal traffic size"),
-    'width'  : '540',
-    'height' : '120',
-    'vertlabel' : ugettext_lazy('bytes/min'),
-    'cf' : 'AVERAGE',
-    'vars' : {
-        'size_recv' : { "type" : "AREA", "color" : "#FF9900", 
-                        "legend" : ugettext_lazy("received size") },
-        'size_sent' : { "type" : "AREA", "color" : "#339999", 
-                        "legend" : ugettext_lazy("sent size") },
-        }
-}
+class AvgTraffic(Graph):
+    title = ugettext_lazy('Average normal traffic')
+    vertlabel = ugettext_lazy('msgs/min')
+    
+    def __init__(self):
+        super(AvgTraffic, self).__init__(
+            sent={'type' : 'AREA', 'color' : '#00FF00', 
+                  "legend" : ugettext_lazy("sent messages")},
+            recv={"type" : "AREA", "color" : "#0000FF", 
+                  "legend" : ugettext_lazy("received messages")}
+            )
+
+class AvgBadTraffic(Graph):
+    title = ugettext_lazy('Average bad traffic')
+    vertlabel = ugettext_lazy('msgs/min')
+    
+    def __init__(self):
+        super(AvgBadTraffic, self).__init__(
+            bounced={'type' : 'AREA', 'color' : '#FFFF00', 
+                     "legend" : ugettext_lazy("bounced messages")},
+            reject={"type" : "AREA", "color" : "#FF0000", 
+                    "legend" : ugettext_lazy("rejected messages")}
+            )
+
+class AvgTrafficSize(Graph):
+    title = ugettext_lazy('Average normal traffic size')
+    vertlabel = ugettext_lazy('bytes/min')
+    
+    def __init__(self):
+        super(AvgTrafficSize, self).__init__(
+            size_recv={'type' : 'AREA', 'color' : '#FF9900', 
+                       "legend" : ugettext_lazy("received size")},
+            size_sent={"type" : "AREA", "color" : "#339999", 
+                       "legend" : ugettext_lazy("sent size")}
+            )
+            
+
+class GraphSet(object):
+    title = None
+    graphs = []
+
+    @property
+    def html_id(self):
+        return self.__class__.__name__.lower()
+
+    def get_graphs(self):
+        if not hasattr(self, '__graph_instances'):
+            self.__graph_instances =  map(lambda gc: gc(), self.graphs)
+        return self.__graph_instances
+
+    def get_graph_names(self):
+        return map(lambda g: g.display_name, self.get_graphs())
+
+class MailTraffic(GraphSet):
+    title = ugettext_lazy('Mail traffic')
+    graphs = [AvgTraffic, AvgBadTraffic, AvgTrafficSize]
diff --git a/modoboa/extensions/stats/management/commands/logparser.py b/modoboa/extensions/stats/management/commands/logparser.py
index 758ad3910..697710610 100644
--- a/modoboa/extensions/stats/management/commands/logparser.py
+++ b/modoboa/extensions/stats/management/commands/logparser.py
@@ -28,8 +28,8 @@ from optparse import make_option
 from modoboa.lib import parameters
 from modoboa.admin.models import Domain
 from modoboa.extensions.stats import Stats
-from modoboa.extensions.stats.grapher import Grapher
-from modoboa.extensions.stats.graph_templates import *
+from modoboa.extensions.stats.grapher import *
+from modoboa.extensions.stats.graph_templates import MailTraffic
 
 rrdstep = 60
 xpoints = 540
@@ -213,7 +213,7 @@ class LogParser(object):
             se = int(int(se) / rrdstep)            # rrd step is one-minute => se = 0
 
             if prev_se != se or prev_mi != mi or prev_ho != ho:
-                cur_t = grapher.str2Time(self.year(mo), mo, da, ho, mi, se)
+                cur_t = str2Time(self.year(mo), mo, da, ho, mi, se)
                 cur_t = cur_t - cur_t % rrdstep
                 prev_mi = mi
                 prev_ho = ho
@@ -274,10 +274,8 @@ class LogParser(object):
             for t in sorted(data.keys()):
                 self.update_rrd(dom, t)
 
-            G.make_defaults(dom, tpl=traffic_avg_template)
-            G.make_defaults(dom, tpl=badtraffic_avg_template)
-            G.make_defaults(dom, tpl=size_avg_template)
-
+            for graph_tpl in MailTraffic().get_graphs():
+                G.make_defaults(dom, graph_tpl)
 
 class Command(BaseCommand):
     help = 'Log file parser'
diff --git a/modoboa/extensions/stats/static/stats/js/stats.js b/modoboa/extensions/stats/static/stats/js/stats.js
index d371966cf..eb51ef009 100644
--- a/modoboa/extensions/stats/static/stats/js/stats.js
+++ b/modoboa/extensions/stats/static/stats/js/stats.js
@@ -69,7 +69,7 @@ Stats.prototype = {
             $("body").notify("error", data.respmsg);
             return;
         }
-        $("#graphs_mailstats").html(data.content);
+        $(".tab-pane.active").html(data.content);
     },
 
     search_domain: function(e) {
diff --git a/modoboa/extensions/stats/templates/stats/index.html b/modoboa/extensions/stats/templates/stats/index.html
index 6eb171e5e..2842aeee7 100644
--- a/modoboa/extensions/stats/templates/stats/index.html
+++ b/modoboa/extensions/stats/templates/stats/index.html
@@ -8,7 +8,7 @@
 $(document).ready(function() {
     var stats = new Stats({
         graphurl: "{% url modoboa.extensions.stats.views.graphs %}",
-        deflocation: "{{ deflocation }}"
+        deflocation: "{{ deflocation|safe }}"
     });
 });
 </script>
@@ -44,12 +44,14 @@ $(document).ready(function() {
 {% endblock %}
 {% block apparea %}
 <div id="graphs" class="tabbable">
-  <ul class="nav nav-tabs">
-    <li class="active"><a href="#graphs_mailstats" data-toggle="tab">{% trans "Mail trafic" %}</a></li>
-  </ul>
-  <div class="tab-content">
-    <div class="tab-pane active" id="graphs_mailstats"></div>
-  </div>
+  <ul class="nav nav-tabs">{% for id, gset in graph_sets.items %}
+    <li {% if forloop.first %}class="active"{% endif %}>
+      <a href="#graphs_{{ gset.html_id }}" data-toggle="tab">{{ gset.title }}</a>
+    </li>
+  </ul>{% endfor %}
+  <div class="tab-content">{% for id, gset in graph_sets.items %}
+    <div class="tab-pane {% if forloop.first %}active{% endif %}" id="graphs_{{ gset.html_id }}"></div>
+  </div>{% endfor %}
 </div>
 {% endblock %}
  
diff --git a/modoboa/extensions/stats/views.py b/modoboa/extensions/stats/views.py
index bc7cadaba..ceccdc93c 100644
--- a/modoboa/extensions/stats/views.py
+++ b/modoboa/extensions/stats/views.py
@@ -6,6 +6,7 @@ from django.contrib.auth.decorators \
     import login_required, user_passes_test, permission_required
 from modoboa.extensions.stats.grapher import *
 from modoboa.lib.exceptions import *
+from modoboa.lib import events
 from graph_templates import *
 
 periods = [{"name" : "day", "label" : ugettext_lazy("Day")},
@@ -16,27 +17,36 @@ periods = [{"name" : "day", "label" : ugettext_lazy("Day")},
 @login_required
 @permission_required("admin.view_mailboxes")
 def index(request):
-    deflocation = ""
+    """
+    FIXME: how to select a default graph set ?
+    """
+    deflocation = "graphs/?gset=mailtraffic&"
     if request.user.is_superuser:
-        deflocation = "graphs/?view=global"
+        deflocation += "view=global"
     else:
         if len(request.user.get_domains()):
-            deflocation = "graphs/?view=%s" % request.user.get_domains()[0].name
+            deflocation += "view=%s" % request.user.get_domains()[0].name
         else:
             raise ModoboaException(_("No statistics available"))
         
     period = request.GET.get("period", "day")
+    graph_sets = events.raiseDictEvent('GetGraphSets')
     return _render(request, 'stats/index.html', {
             "periods" : periods,
             "period" : period,
             "selection" : "stats",
-            "deflocation" : deflocation
+            "deflocation" : deflocation,
+            "graph_sets" : graph_sets
             })
 
 @login_required
 @user_passes_test(lambda u: u.group != "SimpleUsers")
 def graphs(request):
     view = request.GET.get("view", None)
+    gset = request.GET.get("gset", None)
+    gsets = events.raiseDictEvent("GetGraphSets")
+    if not gset in gsets:
+        raise ModoboaException(_("Unknown graphic sets"))
     if not view:
         raise ModoboaException(_("Invalid request"))
     period = request.GET.get("period", "day")
@@ -61,19 +71,15 @@ def graphs(request):
         end = request.GET["end"]
         G = Grapher()
         period_name = "%s_%s" % (start.replace('-',''), end.replace('-',''))
-        for tpl in [traffic_avg_template, badtraffic_avg_template, size_avg_template]:
-            tplvars['graphs'].append(tpl['name'])
-            G.process(tplvars["domain"],
-                      period_name,
-                      str2Time(*start.split('-')),
-                      str2Time(*end.split('-')),
-                      tpl)
+        for tpl in gsets[gset].get_graphs():
+            tplvars['graphs'].append(tpl.display_name)
+            G.process(tplvars["domain"], period_name, str2Time(*start.split('-')),
+                      str2Time(*end.split('-')), tpl)
         tplvars["period_name"] = period_name
         tplvars["start"] = start
         tplvars["end"] = end
     else:
-        # FIXME
-        tplvars['graphs'] = ['traffic', 'badtraffic', 'size']
+        tplvars['graphs'] = gsets[gset].get_graph_names()
 
     return ajax_simple_response(dict(
             status="ok", content=_render_to_string(request, "stats/graphs.html", tplvars)
diff --git a/modoboa/lib/events.py b/modoboa/lib/events.py
index b69844dc2..6fb3245fa 100644
--- a/modoboa/lib/events.py
+++ b/modoboa/lib/events.py
@@ -63,6 +63,14 @@ events = [
 
 callbacks = {}
 
+def registerEvent(name):
+    """Register a new event
+
+    :param name: the event's name
+    """
+    if not name in events:
+        events.append(name)
+
 def register(event, callback):
     """Register a plugin callback for a specific event
 
@@ -71,8 +79,9 @@ def register(event, callback):
     :param event: the event to listen to
     :param callback: a function to execute when the event is raised
     """
-    if not event in events:
-        return 0
+    # if not event in events:
+    #     print "Event %s not registered" % event
+    #     return 0
     if not event in callbacks.keys():
         callbacks[event] = {}
     fullname = "%s.%s" % (callback.__module__, callback.__name__)
@@ -172,3 +181,21 @@ def raiseQueryEvent(event, *args):
     for name, callback in callbacks[event].iteritems():
         result += callback(*args)
     return result
+
+def raiseDictEvent(event, *args):
+    """Raise a specific event and return result as a dictionnary
+
+    Any additional keyword argument will be passed to registered
+    callbacks. Callback answers must be dictionnaries.
+
+    :param event: the event to raise
+    :return: a dictionnary
+    """
+    result = {}
+    if not event in events or not event in callbacks.keys():
+        return result
+    for name, callback in callbacks[event].iteritems():
+        tmp = callback(*args)
+        for k, v in tmp.iteritems():
+            result[k] = v
+    return result