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diff --git a/bundles/org.simantics.diagram/src/org/simantics/diagram/synchronization/graph/MonitorSynchronizer.java b/bundles/org.simantics.diagram/src/org/simantics/diagram/synchronization/graph/MonitorSynchronizer.java
new file mode 100644
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+++ b/bundles/org.simantics.diagram/src/org/simantics/diagram/synchronization/graph/MonitorSynchronizer.java
@@ -0,0 +1,50 @@
+/*******************************************************************************
+ * 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.synchronization.graph;
+
+import org.simantics.databoard.Bindings;
+import org.simantics.db.Resource;
+import org.simantics.diagram.elements.MonitorClass;
+import org.simantics.diagram.synchronization.IModificationQueue;
+import org.simantics.diagram.synchronization.ISynchronizationContext;
+import org.simantics.utils.datastructures.hints.IHintContext.Key;
+import org.simantics.utils.datastructures.hints.IHintObservable;
+
+/**
+ * @author Tuukka Lehtonen
+ */
+public class MonitorSynchronizer extends ResourceSynchronizer {
+
+    public static final MonitorSynchronizer INSTANCE = new MonitorSynchronizer();
+
+    private static final Key[] SYNCHRONIZED_HINTS = {
+        MonitorClass.KEY_DIRECTION,
+    };
+
+    @Override
+    public Key[] getSynchronizedHints() {
+        return SYNCHRONIZED_HINTS;
+    }
+
+    @Override
+    public boolean hintChanged(ISynchronizationContext context, IModificationQueue queue, Resource object, IHintObservable sender, Key key, Object oldValue, Object newValue) {
+        if (MonitorClass.KEY_DIRECTION.equals(key)) {
+            BasicResources br = context.get(GraphSynchronizationHints.BASIC_RESOURCES);
+            Double dir = (Double) newValue;
+            queue.offer(new PropertyModification(object, br.DIA.HasDirection, br.L0.Double, dir, Bindings.DOUBLE), null);
+            return true;
+        }
+
+        return false;
+    }
+
+}