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diff --git a/bundles/org.simantics.browsing.ui.common/src/org/simantics/browsing/ui/common/internal/ComparableWrapper.java b/bundles/org.simantics.browsing.ui.common/src/org/simantics/browsing/ui/common/internal/ComparableWrapper.java
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index 000000000..1c23685ae
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+++ b/bundles/org.simantics.browsing.ui.common/src/org/simantics/browsing/ui/common/internal/ComparableWrapper.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.common.internal;
+
+import java.util.TreeSet;
+
+/**
+ * A wrapper Comparable class for allowing the creation of "multisets" with the
+ * basic {@link TreeSet} implementation.
+ * 
+ * <p>
+ * This class will define the {@link Comparable#compareTo(Object)} method in
+ * such a way that the result will only be 0 if both the wrapped object and the
+ * {@link #orderNumber} argument match.
+ * 
+ * @author Tuukka Lehtonen
+ */
+public class ComparableWrapper<T extends Comparable<T>> implements Comparable<ComparableWrapper<T>> {
+    public final T   t;
+    public final int orderNumber;
+
+    public ComparableWrapper(T t, int orderNumber) {
+        assert t != null;
+        this.t = t;
+        this.orderNumber = orderNumber;
+    }
+
+    @Override
+    public int compareTo(ComparableWrapper<T> o) {
+        int result = t.compareTo(o.t);
+        return result != 0 ? result : (orderNumber - o.orderNumber);
+    }
+}