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diff --git a/bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/GraphEnumerationModifierBase.java b/bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/GraphEnumerationModifierBase.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.graph.impl;
+
+import org.simantics.browsing.ui.common.modifiers.AbstractEnumerationModifier;
+import org.simantics.browsing.ui.common.modifiers.EnumeratedValue;
+import org.simantics.browsing.ui.common.modifiers.Enumeration;
+import org.simantics.db.Session;
+import org.simantics.db.WriteGraph;
+import org.simantics.db.common.request.WriteRequest;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.utils.ObjectUtils;
+
+/**
+ * A graph resource based EnumerationModifier utility implementation.
+ * 
+ * @author Tuukka Lehtonen
+ */
+public abstract class GraphEnumerationModifierBase<T> extends AbstractEnumerationModifier<T> {
+
+    protected final Session  session;
+
+    public GraphEnumerationModifierBase(Session session, Enumeration<T> enumeration, T value) {
+        this(session, enumeration, enumeration.find(value));
+    }
+
+    public GraphEnumerationModifierBase(Session session, Enumeration<T> enumeration, EnumeratedValue<T> value) {
+        super(enumeration, value);
+        if (session == null)
+            throw new NullPointerException("null session");
+        this.session = session;
+    }
+
+    @Override
+    protected void modifyWithObject(final T oldEnumObject, final T enumObject) {
+        if (ObjectUtils.objectEquals(oldEnumObject, enumObject))
+            return;
+
+        try {
+            session.getSession().syncRequest(new WriteRequest() {
+                @Override
+                public void perform(WriteGraph graph) throws DatabaseException {
+//                    System.out.println("old enum object: " + oldEnumObject);
+//                    System.out.println("enum object: " + enumObject);
+                    modifyWithObject(graph, oldEnumObject, enumObject);
+                }
+            });
+        } catch (DatabaseException e) {
+            handleException(e);
+        }
+    }
+
+    /**
+     * Implement this modifier to perform database modifications.
+     * 
+     * @param graph
+     * @param oldEnumObject
+     * @param enumObject
+     */
+    protected abstract void modifyWithObject(WriteGraph graph, T oldEnumObject, T enumObject) throws DatabaseException;
+
+    /**
+     * Client overridable handler for possible exceptions that may occur while
+     * performing the database modifications.
+     * 
+     * <p>
+     * This default implementation merely forwards the exception as a runtime
+     * exception.
+     * 
+     * @param e
+     */
+    protected void handleException(DatabaseException e) {
+        throw new RuntimeException(e);
+    }
+
+
+}