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diff --git a/bundles/org.simantics.g2d/src/org/simantics/g2d/canvas/impl/SGNodeReflection.java b/bundles/org.simantics.g2d/src/org/simantics/g2d/canvas/impl/SGNodeReflection.java
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+++ b/bundles/org.simantics.g2d/src/org/simantics/g2d/canvas/impl/SGNodeReflection.java
@@ -0,0 +1,180 @@
+/*******************************************************************************
+ * 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
+ *******************************************************************************/
+/*
+ *
+ * @author Toni Kalajainen
+ */
+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.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.util.ArrayList;
+import java.util.List;
+
+import org.simantics.g2d.canvas.SGDesignation;
+import org.simantics.scenegraph.g2d.G2DParentNode;
+
+
+public class SGNodeReflection {
+
+    @Retention(RetentionPolicy.RUNTIME)
+    @Target(ElementType.METHOD)
+    public static @interface SGInit {
+        SGDesignation designation() default SGDesignation.CANVAS;
+    }
+
+    @Retention(RetentionPolicy.RUNTIME)
+    @Target(ElementType.METHOD)
+    public static @interface SGCleanup {
+    }
+
+    /**
+     * Scans an object with reflection for all painter methods and returns
+     * an array of ICanvasPainters and priorities.
+     * <p>
+     * The corresponding class of obj must contain methods that meet the following
+     * criteria:
+     *  1) no return value
+     *  2) 1 argument, which is Graphics2D
+     *  3) has annotation Painter
+     *  4) may not throw any Exception
+     *  5) method must be accessible
+     * <p>
+     * Example:
+     *
+     * 	@Painter(priority = Integer.MIN_VALUE)
+     *  public void prePaint(GraphicsContext gc) {
+     *  }
+     *
+     * @param obj object to scan
+     * @return an array of painters and their priorities
+     */
+    public static CanvasSGNodeDefinition[] getSGHandlers(final Object obj)
+    {
+        List<CanvasSGNodeDefinition> result = new ArrayList<CanvasSGNodeDefinition>();
+        Class<?> clazz = obj.getClass();
+
+        for (final Method m : clazz.getMethods()) {
+            SGInit initAnno = m.getAnnotation(SGInit.class);
+            if (initAnno==null) continue;
+
+            SGDesignation initDesignation = initAnno.designation();
+
+            Class<?> returnType = m.getReturnType();
+            if (!returnType.equals(void.class))
+                throw new RuntimeException(clazz.getName()+"."+m.getName()+" return type is invalid");
+
+            @SuppressWarnings("rawtypes")
+            Class[] argTypes = m.getParameterTypes();
+            if (argTypes.length!=1 || !argTypes[0].equals(G2DParentNode.class))
+                throw new RuntimeException(clazz.getName()+"."+m.getName()+" invalid arguments");
+
+            @SuppressWarnings("rawtypes")
+            Class[] exceptionTypes = m.getExceptionTypes();
+            if (exceptionTypes.length!=0)
+                throw new RuntimeException(clazz.getName()+"."+m.getName()+" invalid exceptions");
+
+            try {
+                m.setAccessible(true);
+            } catch (Throwable t)
+            {
+                t.printStackTrace();
+                throw new Error(t);
+            }
+
+            CanvasSGNodeDefinition def = new CanvasSGNodeDefinition(m, initDesignation, null, obj);
+            result.add(def);
+        }
+
+        for (final Method m : clazz.getMethods()) {
+            SGCleanup cleanupAnno = m.getAnnotation(SGCleanup.class);
+            if (cleanupAnno==null) continue;
+
+            Class<?> returnType = m.getReturnType();
+            if (!returnType.equals(void.class))
+                throw new RuntimeException(clazz.getName()+"."+m.getName()+" return type is invalid");
+
+            @SuppressWarnings("rawtypes")
+            Class[] argTypes = m.getParameterTypes();
+            if (argTypes.length!=0)
+                throw new RuntimeException(clazz.getName()+"."+m.getName()+" invalid arguments");
+
+            @SuppressWarnings("rawtypes")
+            Class[] exceptionTypes = m.getExceptionTypes();
+            if (exceptionTypes.length!=0)
+                throw new RuntimeException(clazz.getName()+"."+m.getName()+" invalid exceptions");
+
+            try {
+                m.setAccessible(true);
+            } catch (Throwable t)
+            {
+                t.printStackTrace();
+                throw new Error(t);
+            }
+
+            CanvasSGNodeDefinition def = new CanvasSGNodeDefinition(null, null, m, obj);
+            result.add(def);
+        }
+
+        return result.toArray(new CanvasSGNodeDefinition[0]);
+    }
+
+    public static class CanvasSGNodeDefinition { // FIXME: own classes for init and cleanup
+        public final Method initMethod;
+        public final SGDesignation initDesignation;
+        public final Method cleanupMethod;
+        public final Object obj;
+
+        public void init(G2DParentNode parent) {
+            if(initMethod == null) return;
+            try {
+                initMethod.invoke(obj, parent);
+            } catch (IllegalArgumentException e) {
+                throw new Error(e);
+            } catch (IllegalAccessException e) {
+                throw new Error(e);
+            } catch (InvocationTargetException e) {
+                throw new RuntimeException(e.getCause());
+            }
+        }
+        public void cleanup() {
+            if(cleanupMethod == null) return;
+            try {
+                cleanupMethod.invoke(obj);
+            } catch (IllegalArgumentException e) {
+                throw new Error(e);
+            } catch (IllegalAccessException e) {
+                throw new Error(e);
+            } catch (InvocationTargetException e) {
+                throw new RuntimeException(e.getCause());
+            }
+        }
+        public CanvasSGNodeDefinition(Method initMethod, SGDesignation initDesignation, Method cleanupMethod, Object obj) {
+            this.initMethod = initMethod;
+            this.initDesignation = initDesignation;
+            this.cleanupMethod = cleanupMethod;
+            this.obj = obj;
+        }
+        @Override
+        public String toString() {
+            return String.format("%s %s %s %s",
+                    obj.getClass().getSimpleName(),
+                    initMethod != null ? initMethod.getName() : "no init method",
+                    initDesignation != null ? initDesignation.toString() : "no init designation",
+                    cleanupMethod != null ? cleanupMethod.getName() : "no cleanup method");
+        }
+    }
+}