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diff --git a/bundles/org.simantics.browsing.ui.common/src/org/simantics/browsing/ui/common/extension/internal/EvaluatorFactoryExtensionManager.java b/bundles/org.simantics.browsing.ui.common/src/org/simantics/browsing/ui/common/extension/internal/EvaluatorFactoryExtensionManager.java
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index 000000000..46e82d248
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+++ b/bundles/org.simantics.browsing.ui.common/src/org/simantics/browsing/ui/common/extension/internal/EvaluatorFactoryExtensionManager.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.browsing.ui.common.extension.internal;
+
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.Set;
+
+import org.eclipse.core.runtime.CoreException;
+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.browsing.ui.common.Activator;
+import org.simantics.browsing.ui.common.ErrorLogger;
+import org.simantics.browsing.ui.common.extension.EvaluatorFactory;
+
+/**
+ * @author Tuukka Lehtonen
+ */
+public class EvaluatorFactoryExtensionManager implements IExtensionChangeHandler {
+
+    private final static String                NAMESPACE    = Activator.PLUGIN_ID;
+
+    private final static String                EP_NAME      = "evaluator";
+
+    private ExtensionTracker                   tracker;
+
+    private IEvaluatorFactoryExtension[]            extensions   = new IEvaluatorFactoryExtension[0];
+
+    private static EvaluatorFactoryExtensionManager INSTANCE;
+
+
+    public static synchronized EvaluatorFactoryExtensionManager getInstance() {
+        if (INSTANCE == null)
+            INSTANCE = new EvaluatorFactoryExtensionManager();
+        return INSTANCE;
+    }
+
+    public static synchronized void dispose() {
+        if (INSTANCE != null) {
+            INSTANCE.close();
+            INSTANCE = null;
+        }
+    }
+
+
+    private EvaluatorFactoryExtensionManager() {
+        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 IEvaluatorFactoryExtension[0];
+    }
+
+    public IEvaluatorFactoryExtension[] getExtensions() {
+        return extensions;
+    }
+
+    private void loadExtensions(IConfigurationElement[] elements) {
+
+        Set<IEvaluatorFactoryExtension> newExtensions = new HashSet<IEvaluatorFactoryExtension>(Arrays.asList(extensions));
+
+        for (IConfigurationElement el : elements) {
+            try {
+
+                EvaluatorFactory factory = (EvaluatorFactory)el.createExecutableExtension("class");
+                IEvaluatorFactoryExtension ext = new EvaluatorFactoryExtension(factory);
+
+                // Start tracking the new extension object, its removal will be notified of
+                // with removeExtension(extension, Object[]).
+                tracker.registerObject(el.getDeclaringExtension(), ext, IExtensionTracker.REF_STRONG);
+
+                newExtensions.add(ext);
+            } catch (CoreException e) {
+                ErrorLogger.defaultLogError("Failed to initialize " + EP_NAME + " extension \"" + el.getName()
+                        + "\" with name \"" + el.getAttribute("name") + "\": "
+                        + e.getMessage(), e);
+            }
+        }
+
+        // Atomic assignment
+        this.extensions = newExtensions.toArray(new IEvaluatorFactoryExtension[newExtensions.size()]);
+    }
+
+    @Override
+    public void addExtension(IExtensionTracker tracker, IExtension extension) {
+        loadExtensions(extension.getConfigurationElements());
+    }
+
+    @Override
+    public void removeExtension(IExtension extension, Object[] objects) {
+        Set<IEvaluatorFactoryExtension> newExtensions = new HashSet<IEvaluatorFactoryExtension>(Arrays.asList(extensions));
+
+        for (Object o : objects) {
+            tracker.unregisterObject(extension, o);
+            newExtensions.remove(o);
+        }
+
+        // Atomic assignment
+        this.extensions = newExtensions.toArray(new IEvaluatorFactoryExtension[newExtensions.size()]);
+    }
+
+    public static EvaluatorFactory getFactory(String id) {
+        for(IEvaluatorFactoryExtension ext : getInstance().extensions) {
+            if(ext.factory().getClass().getCanonicalName().equals(id)) return ext.factory();
+        }
+        return null;
+    }
+
+}