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diff --git a/logo/src/xlogo/kernel/gui/GuiMap.java b/logo/src/xlogo/kernel/gui/GuiMap.java
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+++ b/logo/src/xlogo/kernel/gui/GuiMap.java
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+/* XLogo4Schools - A Logo Interpreter specialized for use in schools, based on XLogo by Lo�c Le Coq
+ * Copyright (C) 2013 Marko Zivkovic
+ * 
+ * Contact Information: marko88zivkovic at gmail dot com
+ * 
+ * This program is free software; you can redistribute it and/or modify it 
+ * under the terms of the GNU General Public License as published by the Free 
+ * Software Foundation; either version 2 of the License, or (at your option) 
+ * any later version.  This program is distributed in the hope that it will be 
+ * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of 
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General 
+ * Public License for more details.  You should have received a copy of the 
+ * GNU General Public License along with this program; if not, write to the Free 
+ * Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, 
+ * MA 02110-1301, USA.
+ * 
+ * 
+ * This Java source code belongs to XLogo4Schools, written by Marko Zivkovic
+ * during his Bachelor thesis at the computer science department of ETH Z�rich,
+ * in the year 2013 and/or during future work.
+ * 
+ * It is a reengineered version of XLogo written by Lo�c Le Coq, published
+ * under the GPL License at http://xlogo.tuxfamily.org/
+ * 
+ * Contents of this file were initially written by Lo�c Le Coq,
+ * modifications, extensions, refactorings might have been applied by Marko Zivkovic 
+ */
+
+package xlogo.kernel.gui;
+
+import xlogo.kernel.LogoError;
+
+import java.util.HashMap;
+
+import xlogo.Logo;
+
+public class GuiMap extends HashMap<String, GuiComponent>
+{
+	private static final long	serialVersionUID	= 1L;
+	
+	public GuiMap()
+	{
+	}
+	
+	public void put(GuiComponent gc) throws LogoError
+	{
+		if (this.containsKey(gc.getId()))
+		{
+			throw new LogoError(Logo.messages.getString("gui_exists") + " " + gc.getId());
+		}
+		else
+			this.put(gc.getId(), gc);
+	}
+	
+	public GuiComponent get(Object key)
+	{
+		String k = key.toString().toLowerCase();
+		return super.get(k);
+	}
+	
+	/*
+	 * public void remove(GuiComponent gc) throws myException{
+	 * if (this.containsKey(gc.getId())){
+	 * this.remove(gc.getId());
+	 * }
+	 * else{
+	 * throw new
+	 * myException(app,Logo.messages.getString("no_gui")+" "+gc.getId());
+	 * }
+	 * }
+	 */
+}