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diff --git a/bundles/org.simantics.g2d/src/org/simantics/g2d/canvas/impl/DependencyReflection.java b/bundles/org.simantics.g2d/src/org/simantics/g2d/canvas/impl/DependencyReflection.java
new file mode 100644
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+++ b/bundles/org.simantics.g2d/src/org/simantics/g2d/canvas/impl/DependencyReflection.java
@@ -0,0 +1,101 @@
+/*******************************************************************************
+ * 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.g2d.canvas.impl;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+import java.lang.reflect.Field;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+
+import org.simantics.g2d.canvas.ICanvasParticipant;
+import org.simantics.g2d.diagram.handler.DiagramHandler;
+
+/**
+ * @author Toni Kalajainen
+ */
+public class DependencyReflection {
+
+	private final static ReferenceDefinition[] EMPTY = new ReferenceDefinition[0]; 
+	
+	@Retention(RetentionPolicy.RUNTIME)
+	@Target(ElementType.FIELD)
+	public static @interface Dependency {}
+	@Retention(RetentionPolicy.RUNTIME)
+	@Target(ElementType.FIELD)
+	public static @interface Reference {}
+	
+	/**
+	 * Scans an object with reflection for all dependencies 
+	 * <p>
+	 * Example:
+	 * 
+	 * @Dependency
+	 * ViewportInteractor vi;
+	 * 
+	 * @param obj object to scan
+	 * @return an array of painters and their priorities
+	 */
+	public static ReferenceDefinition[] getDependencies(final Object obj, ReferenceType type)
+	{
+		List<ReferenceDefinition> result = new ArrayList<ReferenceDefinition>();
+		Class<?> clazz = obj.getClass();
+		_addDependencies(clazz, result, type);
+		//if (result==null) return EMPTY;
+		return result.toArray(EMPTY);
+	}
+
+    private static void _addDependencies(Class<?> clazz, Collection<ReferenceDefinition> result, ReferenceType type)
+	{
+		for (final Field f : clazz.getDeclaredFields()) {
+			Class<?> c = f.getType();
+			Dependency dep = (Dependency) f.getAnnotation(Dependency.class);
+			Reference ref = (Reference) f.getAnnotation(Reference.class);
+			if (dep==null && ref==null) continue;
+			ReferenceType referenceType = null;			
+			if ( ICanvasParticipant.class.isAssignableFrom( c ) )
+				referenceType = ReferenceType.CanvasParticipant;
+			else if ( DiagramHandler.class.isAssignableFrom( c ) )
+				referenceType = ReferenceType.DiagramHandler;
+			else assert(false);
+			if (referenceType!=type) continue;
+			
+			assert(!(dep!=null && ref!=null));
+			ReferenceDefinition rd = new ReferenceDefinition();
+			rd.dependency = dep!=null;
+			rd.field = f;
+			rd.requirement = c;
+			rd.referenceType = referenceType;
+			
+			f.setAccessible(true);
+			result.add(rd);
+		}
+		Class<?> superClass = clazz.getSuperclass();
+		if (superClass!=null)
+			_addDependencies(superClass, result, type);
+	}
+	
+	public final static class ReferenceDefinition {
+		public Class<?> requirement;
+		public Field field;
+		public boolean dependency;
+		public ReferenceType referenceType; 
+	}	
+	
+	public static enum ReferenceType {
+		CanvasParticipant, DiagramHandler
+	}
+	
+}