diff -r 5179eff8a9b6 -r ed931970b4ac src/de/uapcore/sudoku/Sudoku.java
--- a/src/de/uapcore/sudoku/Sudoku.java	Sat Jan 26 17:42:07 2013 +0100
+++ b/src/de/uapcore/sudoku/Sudoku.java	Sat Jan 26 18:38:12 2013 +0100
@@ -1,11 +1,37 @@
+/*
+ * Copyright 2013 Mike Becker. All rights reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * 
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
 package de.uapcore.sudoku;
 
 import java.awt.Color;
+import java.awt.Container;
 import java.awt.GridBagConstraints;
 import java.awt.GridBagLayout;
 import java.awt.Insets;
 import javax.swing.JFrame;
-import javax.swing.JRootPane;
 
 /**
  *
@@ -18,21 +44,22 @@
         
         Field f = new Field();
         ActionHandler h = new ActionHandler(f);
+        setJMenuBar(new MainMenu(h).getMenuBar());
         
-        JRootPane root = getRootPane();
+        Container content = getContentPane();
         
-        root.setLayout(new GridBagLayout());
+        content.setLayout(new GridBagLayout());
         GridBagConstraints c = new GridBagConstraints();
         c.insets = new Insets(20, 20, 20, 20);
         c.fill = GridBagConstraints.HORIZONTAL;
         
         c.gridx = 0; c.gridy = 0;
-        root.add(f, c);
+        content.add(f, c);
         c.gridy++;
-        root.add(new ButtonPanel(h), c);
+        content.add(new ButtonPanel(h), c);
         
         pack();
-        root.setBackground(Color.WHITE);
+        content.setBackground(Color.WHITE);
         setLocationByPlatform(true);
         setDefaultCloseOperation(EXIT_ON_CLOSE);
     }