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diff --git a/bundles/org.simantics.browsing.ui.common/src/org/simantics/browsing/ui/common/node/StandardNodeTester.java b/bundles/org.simantics.browsing.ui.common/src/org/simantics/browsing/ui/common/node/StandardNodeTester.java
new file mode 100644
index 000000000..600c1a14b
--- /dev/null
+++ b/bundles/org.simantics.browsing.ui.common/src/org/simantics/browsing/ui/common/node/StandardNodeTester.java
@@ -0,0 +1,51 @@
+/*******************************************************************************
+ * 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.node;
+
+import org.eclipse.core.expressions.PropertyTester;
+import org.eclipse.jface.viewers.IStructuredSelection;
+import org.simantics.browsing.ui.NodeContext;
+import org.simantics.utils.ui.AdaptionUtils;
+
+public class StandardNodeTester extends PropertyTester {
+
+    /**
+     * Tests if the received resource is an instance of any of the URIs
+     * listed in the arguments.
+     */
+    private static final String FUNCTION = "standardNodeFunction";
+
+    @Override
+    public boolean test(final Object receiver, final String property, final Object[] args, final Object expectedValue) {
+
+//        System.out.println("TEST: " + receiver + ", " + property + ", " + Arrays.toString(args) + ", " + expectedValue);
+
+        if (!(receiver instanceof IStructuredSelection))
+            return false;
+
+        NodeContext context = AdaptionUtils.adaptToSingle(receiver, NodeContext.class);
+
+        if (context == null)
+            return false;
+
+        if(FUNCTION.equals(property)) {
+
+            Object function = context.getConstant(StandardNodes.FUNCTION);
+            if(function == null) return false;
+            return args[0].equals(function.toString());
+
+        }
+
+        return false;
+    }
+
+}