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diff --git a/bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/EnumerationVariableModifier.java b/bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/EnumerationVariableModifier.java
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index 000000000..42fa4045d
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+++ b/bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/EnumerationVariableModifier.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 java.util.List;
+
+import org.simantics.browsing.ui.content.Labeler.EnumerationModifier;
+import org.simantics.db.ReadGraph;
+import org.simantics.db.RequestProcessor;
+import org.simantics.db.Session;
+import org.simantics.db.UndoContext;
+import org.simantics.db.common.request.ReadRequest;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.db.layer0.variable.Variable;
+import org.simantics.db.layer0.variable.VariableWrite;
+import org.simantics.utils.datastructures.Callback;
+import org.simantics.utils.ui.ErrorLogger;
+
+/**
+ * @author Tuukka Lehtonen
+ */
+public class EnumerationVariableModifier implements EnumerationModifier {
+
+    protected final Session      session;
+    protected final UndoContext  undoContext;
+    protected final Variable     variable;
+    protected final List<String> allowedValues;
+    protected final String       defaultValue;
+
+    private String             initialValue;
+    protected Throwable        modifierFailed;
+
+    public EnumerationVariableModifier(RequestProcessor processor, UndoContext undoContext, Variable variable,
+            List<String> allowedValues, String defaultValue) {
+        this.session = processor.getSession();
+        this.undoContext = undoContext;
+        this.variable = variable;
+        this.allowedValues = allowedValues;
+        this.defaultValue = defaultValue;
+
+        initializeModifier(processor);
+    }
+
+    protected void initializeModifier(RequestProcessor processor) {
+        try {
+            processor.syncRequest(new ReadRequest() {
+                @Override
+                public void run(ReadGraph graph) throws DatabaseException {
+                    initialValue = getInitialValue(graph);
+                }
+            });
+        } catch (DatabaseException e) {
+            modifierFailed = e;
+        }
+    }
+
+    protected void doModify(final String label) {
+        session.asyncRequest(new VariableWrite(variable, label, null, null),
+                new Callback<DatabaseException>() {
+            @Override
+            public void run(DatabaseException parameter) {
+                if (parameter != null)
+                    ErrorLogger.defaultLogError(parameter);
+            }
+        });
+    }
+
+    protected String getInitialValue(ReadGraph graph) throws DatabaseException {
+        Object value = variable.getValue(graph);
+        return value == null ? defaultValue : value.toString();
+    }
+
+    @Override
+    public String getValue() {
+        return initialValue;
+    }
+
+    @Override
+    public String isValid(String label) {
+        if (modifierFailed != null)
+            return "Could not resolve validator for this value, modification denied. Reason: "
+            + modifierFailed.getMessage();
+        // Validity should already be enforced by the editing UI for
+        // enumerations.
+        return null;
+    }
+
+    @Override
+    public final void modify(String label) {
+        if (modifierFailed != null)
+            // Should never end up here, isValid should prevent it.
+            throw new Error("modifier failed: " + modifierFailed.getMessage());
+        doModify(label);
+    }
+
+    @Override
+    public List<String> getValues() {
+        return allowedValues;
+    }
+
+};