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diff --git a/bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/ContributionStub.java b/bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/ContributionStub.java
new file mode 100644
index 000000000..27f143927
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+++ b/bundles/org.simantics.browsing.ui.graph.impl/src/org/simantics/browsing/ui/graph/impl/ContributionStub.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;
+
+import java.util.Collection;
+
+import org.simantics.browsing.ui.BuiltinKeys;
+import org.simantics.browsing.ui.NodeContext;
+import org.simantics.browsing.ui.PrimitiveQueryUpdater;
+import org.simantics.browsing.ui.common.NodeContextBuilder;
+import org.simantics.browsing.ui.common.NodeContextUtil;
+import org.simantics.browsing.ui.content.ViewpointContribution;
+
+/**
+ * @author Tuukka Lehtonen
+ */
+public abstract class ContributionStub implements ViewpointContribution {
+
+    protected Collection<NodeContext> children    = ViewpointContribution.PENDING_CONTRIBUTION;
+
+    public void setChildren(PrimitiveQueryUpdater updater, Collection<NodeContext> children) {
+    	
+        if (children == null)
+            throw new NullPointerException("null children produced by " + getClass().getName());
+
+    	for(NodeContext c : children) updater.incRef(c);
+        for(NodeContext c : this.children) updater.decRef(c);
+        
+        this.children = children;
+        
+    }
+
+    /**
+     * A utility method for transforming an array of objects into an
+     * INodeContext array which is the return value of a ViewpointFactory.
+     * 
+     * <p>
+     * The INodeContext's are constructed using
+     * {@link NodeContextBuilder#buildWithInput(Object)}.
+     * </p>
+     * 
+     * @param children
+     * @return the specified children wrapped into simple <code>INodeContext</code>s
+     */
+    public NodeContext[] toContextsWithInput(Object... children) {
+        return NodeContextUtil.toContextsWithInput(children);
+    }
+
+    /**
+     * A utility method for transforming a collection of objects into an
+     * INodeContext array which is the return value of a ViewpointFactory.
+     * 
+     * <p>
+     * The INodeContext's are constructed using
+     * {@link NodeContextBuilder#buildWithInput(Object)}.
+     * </p>
+     * 
+     * @param children
+     * @return the specified children wrapped into simple <code>INodeContext</code>s
+     */
+    public Collection<NodeContext> toContextsWithInput(Collection<?> children) {
+        return NodeContextUtil.toContextCollectionWithInput(children);
+    }
+
+    /**
+     * A utility method for transforming a collection of objects into an
+     * INodeContext array which is the return value of a ViewpointFactory.
+     * 
+     * <p>
+     * The INodeContext's are constructed using the specified factory.
+     * </p>
+     * 
+     * @param children
+     * @return the specified children wrapped into INodeContext's through the
+     *         specified <code>factory</code>
+     */
+    public NodeContext[] toContexts(Collection<?> children, NodeContextUtil.NodeContextFactory factory) {
+        return NodeContextUtil.toContexts(children, factory);
+    }
+
+    /**
+     * @param <T>
+     * @param clazz
+     * @return input of the specified class
+     * @throws ClassCastException if the input class does not match the
+     *         specified class
+     * @throws NullPointerException if the input is null
+     */
+    @SuppressWarnings("unchecked")
+    protected <T> T getInput(NodeContext context) {
+        Object o = context.getConstant(BuiltinKeys.INPUT);
+        if (o == null)
+            throw new NullPointerException("null input");
+        return (T) o;
+    }
+
+    /**
+     * @param <T>
+     * @param clazz
+     * @return <code>null</code> if input is <code>null</code> or if the class
+     *         does not match
+     */
+    @SuppressWarnings("unchecked")
+    protected <T> T tryGetInput(NodeContext context, Class<T> clazz) {
+        Object o = context.getConstant(BuiltinKeys.INPUT);
+        if (o != null && clazz.isInstance(o))
+            return (T) o;
+        return null;
+    }
+
+}