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diff --git a/bundles/org.simantics.diagram/src/org/simantics/diagram/symbolcontribution/ModifiableSymbolGroup.java b/bundles/org.simantics.diagram/src/org/simantics/diagram/symbolcontribution/ModifiableSymbolGroup.java
new file mode 100644
index 000000000..f701d1276
--- /dev/null
+++ b/bundles/org.simantics.diagram/src/org/simantics/diagram/symbolcontribution/ModifiableSymbolGroup.java
@@ -0,0 +1,54 @@
+/*******************************************************************************
+ * 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.diagram.symbolcontribution;
+
+import org.simantics.diagram.symbollibrary.IModifiableSymbolGroup;
+import org.simantics.diagram.symbollibrary.ISymbolGroupListener;
+import org.simantics.utils.datastructures.ListenerList;
+
+/**
+ * @author Tuukka Lehtonen
+ */
+public class ModifiableSymbolGroup extends SymbolGroup implements IModifiableSymbolGroup {
+
+    ListenerList<ISymbolGroupListener> listeners = new ListenerList<ISymbolGroupListener>(ISymbolGroupListener.class);
+
+    public ModifiableSymbolGroup(Object identification, String name) {
+        super(identification, name);
+    }
+
+    public ModifiableSymbolGroup(Object identification, String name, String description) {
+        super(identification, name, description);
+    }
+
+    @Override
+    public void addListener(ISymbolGroupListener listener) {
+        listeners.add(listener);
+    }
+
+    @Override
+    public void removeListener(ISymbolGroupListener listener) {
+        listeners.remove(listener);
+    }
+
+    protected void fireListeners() {
+        for (ISymbolGroupListener listener : listeners.getListeners()) {
+            listener.itemsChanged(this);
+        }
+    }
+
+    @Override
+    public String toString() {
+        return super.toString() + "[listener count=" + listeners.size() + "]";
+    }
+
+}