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diff --git a/bundles/org.simantics.diagram/src/org/simantics/diagram/symbolcontribution/CompositeSymbolGroup.java b/bundles/org.simantics.diagram/src/org/simantics/diagram/symbolcontribution/CompositeSymbolGroup.java
new file mode 100644
index 000000000..27d286f87
--- /dev/null
+++ b/bundles/org.simantics.diagram/src/org/simantics/diagram/symbolcontribution/CompositeSymbolGroup.java
@@ -0,0 +1,61 @@
+/*******************************************************************************
+ * 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 java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Comparator;
+
+import org.simantics.diagram.symbollibrary.ISymbolGroup;
+import org.simantics.diagram.symbollibrary.ISymbolItem;
+
+/**
+ * @author Hannu Niemistö
+ */
+public class CompositeSymbolGroup extends ModifiableSymbolGroup {
+
+    Collection<ISymbolGroup> groups = new ArrayList<ISymbolGroup>(4);
+
+    public CompositeSymbolGroup(Object identification, String name, String description) {
+        super(identification, name, description);
+    }
+
+    public void add(ISymbolGroup group) {
+        groups.add(group);
+    }
+
+    public Collection<ISymbolGroup> getGroups() {
+        return groups;
+    }
+
+    @Override
+    public ISymbolItem[] getItems() {
+        ArrayList<ISymbolItem> items = new ArrayList<ISymbolItem>();
+        for(ISymbolGroup group : groups)
+            for(ISymbolItem item : group.getItems())
+                items.add(new GroupProxySymbolItem(item,  this));
+        Collections.sort(items, new Comparator<ISymbolItem>() {
+            @Override
+            public int compare(ISymbolItem o1, ISymbolItem o2) {
+                return o1.getName().compareTo(o2.getName());
+            }
+        });
+        return items.toArray(new ISymbolItem[items.size()]);
+    }
+
+    @Override
+    public String toString() {
+        return super.toString() + "[composed group count=" + groups.size() + "]";
+    }
+
+}