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diff --git a/bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/contribution/ViewpointContributionImpl.java b/bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/contribution/ViewpointContributionImpl.java
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index 000000000..bf59ade74
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+++ b/bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/contribution/ViewpointContributionImpl.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.contribution;
+
+import java.util.Collection;
+
+import org.simantics.browsing.ui.NodeContext;
+import org.simantics.browsing.ui.PrimitiveQueryUpdater;
+import org.simantics.browsing.ui.BuiltinKeys.ViewpointContributionKey;
+import org.simantics.db.AsyncReadGraph;
+import org.simantics.db.procedure.Listener;
+import org.simantics.db.procedure.Procedure;
+import org.simantics.utils.ui.ErrorLogger;
+
+/**
+ * Implement {@link #children(AsyncReadGraph)} and {@link #hasChildren(AsyncReadGraph)}.
+ * 
+ * @author Tuukka Lehtonen
+ */
+abstract public class ViewpointContributionImpl extends FinalViewpointContributionImpl {
+
+    public ViewpointContributionImpl(PrimitiveQueryUpdater updater,
+            NodeContext context, ViewpointContributionKey key) {
+        super(updater, context, key);
+    }
+
+    @Override
+    protected Procedure<Collection<NodeContext>> createProcedure() {
+
+        return new Listener<Collection<NodeContext>>() {
+
+            @Override
+            public void execute(Collection<NodeContext> result) {
+                replaceChildrenResult(result);
+            }
+
+            @Override
+            public boolean isDisposed() {
+                return updater.isDisposed();
+            }
+
+            public void exception(Throwable t) {
+                ErrorLogger.defaultLogError("LazyContributionImpl.childQuery failed, see exception for details.", t);
+            }
+
+            @Override
+            public String toString() {
+                return "LazyContributionImpl[" + System.identityHashCode(ViewpointContributionImpl.this) + "].childProcedure";
+            }
+
+        };
+
+    }
+
+
+}