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diff --git a/org.simantics.g3d/src/org/simantics/proconf/g3d/common/StructuredResourceSelection.java b/org.simantics.g3d/src/org/simantics/proconf/g3d/common/StructuredResourceSelection.java
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+++ b/org.simantics.g3d/src/org/simantics/proconf/g3d/common/StructuredResourceSelection.java
@@ -0,0 +1,173 @@
+/*******************************************************************************
+ * Copyright (c) 2007- VTT Technical Research Centre of Finland.
+ * 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.proconf.g3d.common;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Iterator;
+import java.util.List;
+
+import org.eclipse.jface.viewers.IStructuredSelection;
+import org.simantics.db.Resource;
+
+
+/**
+ * StructuredSelection that contains ResourceSelections
+ * 
+ * @author Marko Luukkainen
+ * @author Tuukka Lehtonen
+ */
+public class StructuredResourceSelection implements IStructuredSelection {
+    
+    public static final StructuredResourceSelection EMPTY = new StructuredResourceSelection() {
+        // Create an empty fixed size List to ensure the list is not modified.
+        private List<Resource> empty = Arrays.asList(); 
+        
+        public void add(Resource rs) {
+            throw new UnsupportedOperationException("BUG: attempted to modify StructuredResourceSelection.EMPTY");
+        }
+        public List<Resource> getSelectionList() {
+            return empty;
+        }
+    };
+
+    private List<Resource> selections;
+    
+    /**
+     * Creates a new selection that doesn't contain any items
+     */
+    public StructuredResourceSelection() {
+    }
+
+    public StructuredResourceSelection(Resource rs) {
+        getSelectionList().add(rs);
+    }
+
+    public StructuredResourceSelection(Resource... rss) {
+        List<Resource> s = getSelectionList();
+        for (Resource rs : rss)
+            s.add(rs);
+    }
+
+    public void add(Resource rs) {
+        getSelectionList().add(rs);
+    }
+
+    public List<Resource> getSelectionList() {
+        if (selections == null) {
+            selections = new ArrayList<Resource>();
+        }
+        return selections;
+    }
+
+    /*
+     * (non-Javadoc)
+     * 
+     * @see org.eclipse.jface.viewers.ISelection#isEmpty()
+     */
+    public boolean isEmpty() {
+        return selections == null || selections.isEmpty();
+    }
+
+    /*
+     * (non-Javadoc)
+     * 
+     * @see org.eclipse.jface.viewers.IStructuredSelection#getFirstElement()
+     */
+    public Object getFirstElement() {
+        if (!isEmpty())
+            return selections.get(0);
+        return null;
+    }
+
+    /*
+     * (non-Javadoc)
+     * 
+     * @see org.eclipse.jface.viewers.IStructuredSelection#iterator()
+     */
+    public Iterator<Resource> iterator() {
+        return getSelectionList().iterator();
+    }
+
+    /*
+     * (non-Javadoc)
+     * 
+     * @see org.eclipse.jface.viewers.IStructuredSelection#size()
+     */
+    public int size() {
+        return selections == null ? 0 : selections.size();
+    }
+
+    /*
+     * (non-Javadoc)
+     * 
+     * @see org.eclipse.jface.viewers.IStructuredSelection#toArray()
+     */
+    public Object[] toArray() {
+        return selections == null ? new Object[0] : selections.toArray();
+    }
+
+    /*
+     * (non-Javadoc)
+     * 
+     * @see org.eclipse.jface.viewers.IStructuredSelection#toList()
+     */
+    public List<Resource> toList() {
+        return selections == null ? Arrays.asList(new Resource[0]) : selections;
+    }
+
+    /**
+     * Returns whether this structured selection is equal to the given object.
+     * Two structured selections are equal iff they contain the same elements
+     * in the same order.
+     *
+     * @param o the other object
+     * @return <code>true</code> if they are equal, and <code>false</code> otherwise
+     */
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        // null and other classes
+        if (!(o instanceof StructuredResourceSelection)) {
+            return false;
+        }
+        StructuredResourceSelection other = (StructuredResourceSelection) o;
+
+        // either or both empty?
+        if (isEmpty()) {
+            return other.isEmpty();
+        }
+        if (other.isEmpty()) {
+            return false;
+        }
+
+        // check size
+        if (size() != other.size())
+            return false;
+        
+        // element comparison
+        Iterator<Resource> it = iterator();
+        Iterator<Resource> otherIt = other.iterator();
+        while (it.hasNext()) {
+            if (!it.next().equals(otherIt.next()))
+                return false;
+        }
+        
+        return true;
+    }
+    
+    @Override
+    public String toString() {
+    	return Arrays.toString(getSelectionList().toArray());
+    }
+    
+}