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diff --git a/bundles/org.simantics.browsing.ui.common/src/org/simantics/browsing/ui/common/extension/ContributorBindingExtensionManager.java b/bundles/org.simantics.browsing.ui.common/src/org/simantics/browsing/ui/common/extension/ContributorBindingExtensionManager.java
new file mode 100644
index 000000000..4f03eb1f6
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+++ b/bundles/org.simantics.browsing.ui.common/src/org/simantics/browsing/ui/common/extension/ContributorBindingExtensionManager.java
@@ -0,0 +1,170 @@
+/*******************************************************************************
+ * 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;
+
+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.extension.internal.ContributorBindingExtension;
+import org.simantics.browsing.ui.common.extension.internal.ContributorImplementationBinding;
+import org.simantics.browsing.ui.common.extension.internal.ContributorReferenceBinding;
+import org.simantics.browsing.ui.content.Contributor;
+import org.simantics.browsing.ui.content.ContributorBinding;
+import org.simantics.scl.reflection.OntologyVersions;
+import org.simantics.utils.strings.StringUtils;
+
+/**
+ * @author Antti Villberg
+ */
+public abstract class ContributorBindingExtensionManager<Factory> implements IExtensionChangeHandler {
+
+    private final static String                    NAMESPACE  = Activator.PLUGIN_ID;
+
+    private ExtensionTracker                       tracker;
+
+    private static final OntologyVersions VERSIONS = OntologyVersions.getInstance();
+    
+    @SuppressWarnings("unchecked")
+    private ContributorBindingExtension<Factory>[] extensions = new ContributorBindingExtension[0];
+
+    abstract String getExtensionPointName();
+
+    ContributorBindingExtensionManager() {
+        tracker = new ExtensionTracker();
+
+        // Cache defined actions
+        IExtensionPoint expt = Platform.getExtensionRegistry().getExtensionPoint(NAMESPACE, getExtensionPointName());
+        loadExtensions(expt.getConfigurationElements());
+
+        // Start tracking for new and removed extensions
+        IFilter filter = ExtensionTracker.createExtensionPointFilter(expt);
+        tracker.registerHandler(this, filter);
+    }
+
+    @SuppressWarnings("unchecked")
+    void close() {
+        tracker.close();
+        tracker = null;
+        extensions = new ContributorBindingExtension[0];
+    }
+
+    public ContributorBindingExtension<Factory>[] getExtensions() {
+        return extensions;
+    }
+
+    abstract ContributorReferenceBinding<Factory> createReferenceBinding(double preference, String browseContext, String factoryId);
+
+    @SuppressWarnings("unchecked")
+    private void loadExtensions(IConfigurationElement[] elements) {
+
+        Set<ContributorBindingExtension<Factory>> newExtensions = new HashSet<ContributorBindingExtension<Factory>>(Arrays.asList(extensions));
+
+        for (IConfigurationElement el : elements) {
+
+            String browseContext = VERSIONS.currentVersion(StringUtils.safeString(el.getAttribute("browseContext")));
+
+            for(IConfigurationElement child : el.getChildren("reference")) {
+
+                double preference = StringUtils.safeDouble(child.getAttribute("preference"));
+                String factoryId = StringUtils.safeString(child.getAttribute("id"));
+//                ContributionBindingExtension<Factory> ext = new ImagerContributionReferenceBinding(preference, browseContext, factoryId);
+                ContributorBindingExtension<Factory> ext = createReferenceBinding(preference, browseContext, factoryId);
+
+                // 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);
+
+            }
+
+            for(IConfigurationElement child : el.getChildren("implementation")) {
+
+                double preference = StringUtils.safeDouble(child.getAttribute("preference"));
+
+                try {
+
+                    Contributor<Factory> factory = (Contributor<Factory>) child.createExecutableExtension("class");
+                    ContributorBindingExtension<Factory> ext = new ContributorImplementationBinding<Factory>(preference, browseContext, 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) {
+
+                    System.out.println(" == Could not load ViewpointContributionFactory '" + child.getAttribute("class") + "' due to the following error: " + e.getMessage()  );
+	                
+                }
+
+            }
+
+        }
+
+        // Atomic assignment
+        this.extensions = newExtensions.toArray(new ContributorBindingExtension[newExtensions.size()]);
+    }
+
+    @Override
+    public void addExtension(IExtensionTracker tracker, IExtension extension) {
+        loadExtensions(extension.getConfigurationElements());
+    }
+
+    @SuppressWarnings("unchecked")
+    @Override
+    public void removeExtension(IExtension extension, Object[] objects) {
+        Set<ContributorBindingExtension<Factory>> newExtensions = new HashSet<ContributorBindingExtension<Factory>>(Arrays.asList(extensions));
+
+        for (Object o : objects) {
+            tracker.unregisterObject(extension, o);
+            newExtensions.remove(o);
+        }
+
+        // Atomic assignment
+        this.extensions = newExtensions.toArray(new ContributorBindingExtension[newExtensions.size()]);
+    }
+
+    public Set<ContributorBinding<Factory>> getBoundContributions(Set<String> browseContexts) {
+
+        HashSet<ContributorBinding<Factory>> result = new HashSet<ContributorBinding<Factory>>();
+
+        for(ContributorBindingExtension<Factory> binding : getExtensions()) {
+            if(browseContexts.contains(binding.getBrowseContext())) {
+                Contributor<Factory> factory = binding.getFactory();
+                if(factory != null) {
+//                    System.out.println("----------- Plugin contribution " + binding.getFactory() + " " + binding.getPreference());
+                    result.add(new ContributorBindingImpl<Factory>(binding.getPreference(), factory));
+                } else {
+//                    System.out.println("FAILED: ----------- No factory for " + binding);
+                }
+
+            }
+        }
+
+        return result;
+
+    }
+
+}