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diff --git a/core/org.eclipse.papyrus.sasheditor/src/org/eclipse/papyrus/sasheditor/extension/ExtensionMultiDiagramEditor.java b/core/org.eclipse.papyrus.sasheditor/src/org/eclipse/papyrus/sasheditor/extension/ExtensionMultiDiagramEditor.java
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+++ b/core/org.eclipse.papyrus.sasheditor/src/org/eclipse/papyrus/sasheditor/extension/ExtensionMultiDiagramEditor.java
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+/*****************************************************************************
+ * Copyright (c) 2008 CEA LIST.
+ *
+ *    
+ * 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:
+ *  Cedric Dumoulin  Cedric.dumoulin@lifl.fr - Initial API and implementation
+ *
+  *****************************************************************************/
+package org.eclipse.papyrus.sasheditor.extension;
+
+import org.eclipse.gef.ui.actions.ActionRegistry;
+import org.eclipse.jface.action.IAction;
+import org.eclipse.papyrus.sasheditor.gef.EditorNotFoundException;
+import org.eclipse.papyrus.sasheditor.gef.GefMultiPageEditorPart;
+import org.eclipse.ui.IEditorInput;
+import org.eclipse.ui.IEditorPart;
+
+/**
+ * MultiDiagram Editor whose nested editors can be declared using the Eclipse extension mechanism.
+ * <p>
+ * This class add methods to add nested editors from extensions.
+ * </p>
+ */
+public abstract class ExtensionMultiDiagramEditor extends GefMultiPageEditorPart {
+
+	/** shared objects among all diagrams */
+	private MultiDiagramSharedObjects sharedObject;
+
+	/** Registry to store editor factories */
+	private EditorFactoryRegistry editorRegistry;
+
+	/**
+	 * Create a PageEditor for the specified model. Default implementation delegates to pageEditorFactory.createPageEditorFor(model);
+	 * 
+	 * @param model
+	 *            the diagram to be displayed
+	 * @return the Graphical Editor that displays the specified diagram
+	 * @throws EditorNotFoundException
+	 *             No editor handling the model can be found.
+	 */
+	protected IEditorPart createPageEditor(Object model) throws EditorNotFoundException {
+		return getEditorRegistry().createEditorFor(getSharedObjects(), model);
+	}
+
+	/**
+	 * Get the EditorRegistry used to create editor instances. This default implementation return the singleton eINSTANCE. This method can be subclassed to return another registry.
+	 * 
+	 * @return the singleton eINSTANCE of editor registry
+	 */
+	protected EditorFactoryRegistry getEditorRegistry() {
+		if (editorRegistry == null) {
+			editorRegistry = createEditorRegistry();
+		}
+		return editorRegistry;
+	}
+
+	/**
+	 * Return the EditorRegistry for nested editor descriptors. Subclass should implements this method in order to return the registry associated to the extension point namespace.
+	 * 
+	 * @return the EditorRegistry for nested editor descriptors
+	 */
+	abstract protected EditorFactoryRegistry createEditorRegistry();
+
+	/**
+	 * Create shared object. The shared object will be initialized with a call to initSharedObject();
+	 * 
+	 * @return the created shared object.
+	 */
+	abstract protected MultiDiagramSharedObjects createSharedObject();
+
+	/**
+	 * Get the object sharing all instances needed by the editor.
+	 * 
+	 * @return the singleton eINSTANCE of MultiDiagramSharedObjects.
+	 */
+	public MultiDiagramSharedObjects getSharedObjects() {
+		if (sharedObject == null) {
+			sharedObject = createSharedObject();
+			initSharedObject(sharedObject);
+		}
+		return sharedObject;
+	}
+
+	/**
+	 * Initialize the newly created shared object.
+	 */
+	protected void initSharedObject(MultiDiagramSharedObjects sharedObject) {
+	}
+
+	/**
+	 * Creates actions for this editor. Subclasses should override this method to create and register actions with the {@link ActionRegistry}.
+	 */
+	protected void createActions() {
+		ActionRegistry registry = getActionRegistry();
+		IAction action;
+
+	}
+
+	/**
+	 * {@inheritDoc}
+	 */
+	@Override
+	public void setInput(IEditorInput input) {
+		// Create global actions from the nested editors.
+		createActions();
+		super.setInput(input);
+	}
+}