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diff --git a/bundles/org.simantics.ui/src/org/simantics/ui/workbench/PerspectiveContextBindingManager.java b/bundles/org.simantics.ui/src/org/simantics/ui/workbench/PerspectiveContextBindingManager.java
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+/*******************************************************************************
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management
+ * in Industry THTH ry.
+ * 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:
+ *     VTT Technical Research Centre of Finland - initial API and implementation
+ *******************************************************************************/
+package org.simantics.ui.workbench;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+
+import org.eclipse.core.runtime.IConfigurationElement;
+import org.eclipse.core.runtime.IExtension;
+import org.eclipse.core.runtime.IExtensionPoint;
+import org.eclipse.core.runtime.Platform;
+import org.eclipse.core.runtime.dynamichelpers.ExtensionTracker;
+import org.eclipse.core.runtime.dynamichelpers.IExtensionChangeHandler;
+import org.eclipse.core.runtime.dynamichelpers.IExtensionTracker;
+import org.eclipse.core.runtime.dynamichelpers.IFilter;
+import org.simantics.ui.internal.Activator;
+import org.simantics.utils.datastructures.MapList;
+
+public class PerspectiveContextBindingManager implements IExtensionChangeHandler {
+
+    private final static String                           NAMESPACE  = Activator.PLUGIN_ID;
+
+    private final static String                           EP_NAME    = "perspectiveContextBinding";
+
+    private ExtensionTracker                              tracker;
+
+    private MapList<String, IPerspectiveContextExtension> extensions = new MapList<String, IPerspectiveContextExtension>();
+
+    private static PerspectiveContextBindingManager       INSTANCE;
+
+    public static synchronized PerspectiveContextBindingManager getInstance() {
+        if (INSTANCE == null)
+            INSTANCE = new PerspectiveContextBindingManager();
+        return INSTANCE;
+    }
+
+    public static synchronized void dispose() {
+        if (INSTANCE != null) {
+            INSTANCE.close();
+            INSTANCE = null;
+        }
+    }
+
+    private PerspectiveContextBindingManager() {
+        tracker = new ExtensionTracker();
+
+        // Cache defined actions
+        IExtensionPoint expt = Platform.getExtensionRegistry().getExtensionPoint(NAMESPACE, EP_NAME);
+        loadExtensions(expt.getConfigurationElements());
+
+        // Start tracking for new and removed extensions
+        IFilter filter = ExtensionTracker.createExtensionPointFilter(expt);
+        tracker.registerHandler(this, filter);
+    }
+
+    private void close() {
+        tracker.close();
+        tracker = null;
+        extensions = new MapList<String, IPerspectiveContextExtension>();
+    }
+
+    public synchronized List<IPerspectiveContextExtension> getExtensions(String perspectiveId) {
+        List<IPerspectiveContextExtension> exts = extensions.getValues(perspectiveId);
+        if (exts == null)
+            return Arrays.asList();
+        return Collections.unmodifiableList(exts);
+    }
+
+    private synchronized void loadExtensions(IConfigurationElement[] elements) {
+        for (IConfigurationElement el : elements) {
+            String perspectiveId = el.getAttribute("perspectiveId");
+            String contextId = el.getAttribute("contextIds");
+            String[] contextIds = contextId.split(",");
+
+            IPerspectiveContextExtension ext = new IPerspectiveContextExtension.Stub(perspectiveId, contextIds);
+
+            // Start tracking the new extension object, its removal will be notified of
+            // with removeExtension(extension, Object[]).
+            tracker.registerObject(el.getDeclaringExtension(), ext, IExtensionTracker.REF_STRONG);
+
+            extensions.add(perspectiveId, ext);
+        }
+    }
+
+    @Override
+    public void addExtension(IExtensionTracker tracker, IExtension extension) {
+        loadExtensions(extension.getConfigurationElements());
+    }
+
+    @Override
+    public synchronized void removeExtension(IExtension extension, Object[] objects) {
+       
+        for (Object o : objects) {
+            IPerspectiveContextExtension ext = (IPerspectiveContextExtension) o;
+            tracker.unregisterObject(extension, ext);
+            extensions.remove(ext.getPerspectiveId(), ext);
+        }
+
+    }
+
+}