diff --git a/plugins/org.obeonetwork.dsl.uml2.design/plugin.xml b/plugins/org.obeonetwork.dsl.uml2.design/plugin.xml
index 3e72ddef8..dd38d4f2c 100644
--- a/plugins/org.obeonetwork.dsl.uml2.design/plugin.xml
+++ b/plugins/org.obeonetwork.dsl.uml2.design/plugin.xml
@@ -488,4 +488,10 @@ Contributors:
         </constraints>
      </constraintProvider>
   </extension>
+   <extension
+         point="org.eclipse.sirius.sessionManagerListener">
+      <listener
+            class="org.obeonetwork.dsl.uml2.design.UmlDesignerSessionManagerListener">
+      </listener>
+   </extension>
 </plugin>
diff --git a/plugins/org.obeonetwork.dsl.uml2.design/src/org/obeonetwork/dsl/uml2/design/UMLDesignerPlugin.java b/plugins/org.obeonetwork.dsl.uml2.design/src/org/obeonetwork/dsl/uml2/design/UMLDesignerPlugin.java
index 2ad94cdff..b4f73cc5d 100644
--- a/plugins/org.obeonetwork.dsl.uml2.design/src/org/obeonetwork/dsl/uml2/design/UMLDesignerPlugin.java
+++ b/plugins/org.obeonetwork.dsl.uml2.design/src/org/obeonetwork/dsl/uml2/design/UMLDesignerPlugin.java
@@ -15,12 +15,8 @@
 
 import org.eclipse.core.runtime.Status;
 import org.eclipse.sirius.business.api.componentization.ViewpointRegistry;
-import org.eclipse.sirius.business.api.session.Session;
-import org.eclipse.sirius.business.api.session.SessionManager;
-import org.eclipse.sirius.business.api.session.SessionManagerListener;
 import org.eclipse.sirius.viewpoint.description.Viewpoint;
 import org.eclipse.ui.plugin.AbstractUIPlugin;
-import org.obeonetwork.dsl.uml2.design.services.AutosizeTrigger;
 import org.osgi.framework.BundleContext;
 
 /**
@@ -45,8 +41,6 @@ public class UMLDesignerPlugin extends AbstractUIPlugin {
 	 */
 	private static Set<Viewpoint> viewpoints;
 
-	private SessionManagerListener notifWhenSessionAreCreated;
-
 	/**
 	 * The constructor.
 	 */
@@ -62,14 +56,6 @@ public void start(BundleContext context) throws Exception {
 		viewpoints = new HashSet<Viewpoint>();
 		viewpoints.addAll(ViewpointRegistry.getInstance().registerFromPlugin(
 				PLUGIN_ID + "/description/uml2.odesign"));
-		notifWhenSessionAreCreated = new SessionManagerListener.Stub() {
-			@Override
-			public void notifyAddSession(Session newSession) {
-				newSession.getEventBroker().addLocalTrigger(AutosizeTrigger.IS_GMF_NODE_ATTACHMENT,
-						new AutosizeTrigger(newSession.getTransactionalEditingDomain()));
-			}
-		};
-		SessionManager.INSTANCE.addSessionsListener(notifWhenSessionAreCreated);
 	}
 
 	/**
diff --git a/plugins/org.obeonetwork.dsl.uml2.design/src/org/obeonetwork/dsl/uml2/design/UmlDesignerSessionManagerListener.java b/plugins/org.obeonetwork.dsl.uml2.design/src/org/obeonetwork/dsl/uml2/design/UmlDesignerSessionManagerListener.java
new file mode 100644
index 000000000..203885be1
--- /dev/null
+++ b/plugins/org.obeonetwork.dsl.uml2.design/src/org/obeonetwork/dsl/uml2/design/UmlDesignerSessionManagerListener.java
@@ -0,0 +1,46 @@
+/*******************************************************************************
+ * Copyright (c) 2014 Obeo.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ * 
+ * Contributors:
+ *     Obeo - initial API and implementation
+ *******************************************************************************/
+package org.obeonetwork.dsl.uml2.design;
+
+import org.eclipse.sirius.business.api.session.Session;
+import org.eclipse.sirius.business.api.session.SessionManagerListener;
+import org.eclipse.sirius.viewpoint.description.Viewpoint;
+import org.obeonetwork.dsl.uml2.design.services.AutosizeTrigger;
+
+/**
+ * Session listener.
+ * 
+ * @author Melanie Bats <a href="mailto:melanie.bats@obeo.fr">melanie.bats@obeo.fr</a>
+ */
+public class UmlDesignerSessionManagerListener implements SessionManagerListener {
+
+	public void notifyAddSession(Session newSession) {
+		newSession.getEventBroker().addLocalTrigger(AutosizeTrigger.IS_GMF_NODE_ATTACHMENT,
+				new AutosizeTrigger(newSession.getTransactionalEditingDomain()));
+	}
+
+	public void notifyRemoveSession(Session removedSession) {
+		// Nothing
+	}
+
+	public void viewpointSelected(Viewpoint selectedSirius) {
+		// Nothing
+	}
+
+	public void viewpointDeselected(Viewpoint deselectedSirius) {
+		// Nothing
+	}
+
+	public void notify(Session updated, int notification) {
+		// Nothing
+	}
+
+}