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diff --git a/bundles/org.simantics.diagram/src/org/simantics/diagram/flag/FlagPropertyTester.java b/bundles/org.simantics.diagram/src/org/simantics/diagram/flag/FlagPropertyTester.java
new file mode 100644
index 000000000..67b5808fb
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+++ b/bundles/org.simantics.diagram/src/org/simantics/diagram/flag/FlagPropertyTester.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.diagram.flag;
+
+import org.eclipse.core.expressions.PropertyTester;
+import org.simantics.DatabaseJob;
+import org.simantics.db.ReadGraph;
+import org.simantics.db.Resource;
+import org.simantics.db.Session;
+import org.simantics.db.common.request.UniqueRead;
+import org.simantics.db.common.utils.RequestUtil;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.ui.SimanticsUI;
+import org.simantics.ui.utils.ResourceAdaptionUtils;
+
+/**
+ * An Eclipse property tester for flag elements.
+ * 
+ * @author Tuukka Lehtonen
+ */
+public class FlagPropertyTester extends PropertyTester {
+
+    /**
+     * Tests if the received flag resource is connected to a counterpart.
+     * Default expected value is true.
+     */
+    private static final String CONNECTED = "connected";
+
+    /**
+     * Tests if the received flag resource is connected to a counterpart.
+     * Default expected value is true.
+     */
+    private static final String LOCALLY_CONNECTED = "locallyConnected";
+
+    /**
+     * Tests if the received flag resource is marked as an external flag.
+     */
+    private static final String EXTERNAL = "external";
+
+    /**
+     * Tests if the received flag resource is a merged flag with more than 1
+     * counterpart.
+     */
+    private static final String MERGED = "merged";
+
+    @Override
+    public boolean test(Object receiver, final String property, final Object[] args, final Object expectedValue) {
+        final Resource resource = ResourceAdaptionUtils.toSingleResource(receiver);
+        if (resource == null)
+            return false;
+
+        Session session = SimanticsUI.peekSession();
+        if (session == null)
+            return false;
+
+        if (DatabaseJob.inProgress())
+            return false;
+
+        try {
+            return RequestUtil.trySyncRequest(
+                    session,
+                    SimanticsUI.UI_THREAD_REQUEST_START_TIMEOUT,
+                    SimanticsUI.UI_THREAD_REQUEST_EXECUTION_TIMEOUT,
+                    false,
+                    new UniqueRead<Boolean>() {
+                @Override
+                public Boolean perform(ReadGraph g) throws DatabaseException {
+                    return Boolean.valueOf(doTest(g, resource, property, args, expectedValue));
+                }
+            });
+        } catch (DatabaseException | InterruptedException e) {
+            // Purposefully not logging these exceptions, there might be way too
+            // many even under normal circumstances.
+            // TODO: add debug tracing options controlling the printing of these exceptions
+            return false;
+        }
+    }
+
+    private boolean doTest(ReadGraph graph, Resource resource, String property, Object[] args, Object expectedValue) throws DatabaseException {
+        if (EXTERNAL.equals(property)) {
+            boolean expected = parseBoolean(expectedValue, true);
+            boolean ext = FlagUtil.isExternal(graph, resource);
+            return ext ? expected : expected;
+        } else if (CONNECTED.equals(property)) {
+            boolean expected = parseBoolean(expectedValue, true);
+            boolean isConnected = 
+                FlagUtil.countCounterparts(graph, resource) > 0 ||
+                FlagUtil.isLifted(graph, resource);
+            return isConnected == expected;
+        } else if (LOCALLY_CONNECTED.equals(property)) {
+            boolean expected = parseBoolean(expectedValue, true);
+            boolean isLocallyConnected = 
+                FlagUtil.isJoinedInSingleDiagram(graph, resource);
+            return isLocallyConnected == expected;
+        } else if (MERGED.equals(property)) {
+            boolean expected = parseBoolean(expectedValue, true);
+            boolean isMerged = FlagUtil.countCounterparts(graph, resource) > 1;
+            return isMerged == expected;
+        }
+        return false;
+    }
+
+    boolean parseBoolean(Object value, boolean defaultValue) {
+        if (value instanceof Boolean)
+            return (Boolean) value;
+        if (value instanceof String)
+            return Boolean.parseBoolean((String) value);
+        return defaultValue;
+    }
+
+}