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diff --git a/libjava/classpath/javax/swing/plaf/ComboBoxUI.java b/libjava/classpath/javax/swing/plaf/ComboBoxUI.java
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+/* ComboBoxUI.java --
+   Copyright (C) 2002, 2003 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath 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, or (at your option)
+any later version.
+
+GNU Classpath 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 GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+package javax.swing.plaf;
+
+import javax.swing.JComboBox;
+
+/**
+ * An abstract base class for delegates that implement the pluggable
+ * look and feel for a <code>JButton</code>.
+ *
+ * @see javax.swing.JComboBox
+ *
+ * @author Andrew Selkirk
+ * @author Sascha Brawer (brawer@dandelis.ch)
+ */
+public abstract class ComboBoxUI
+  extends ComponentUI
+{
+  /**
+   * Constructs a new <code>ComboBoxUI</code>.
+   */
+  public ComboBoxUI()
+  {
+  }
+  
+  
+  /**
+   * Sets the visibility of the popup button.
+   *
+   * @param c the <code>JComboBox</code> whose popup
+   *        is shown or hidden.
+   *
+   * @param visible <code>true</code> to show the popup, <code>false</code>
+   *        to hide it.
+   */
+  public abstract void setPopupVisible(JComboBox c, boolean visible);
+
+
+  /**
+   * Determines whether the popup button is currently visible.
+   *
+   * @param c the <code>JComboBox</code> whose popup visibility
+   *        is retrieved.
+   *
+   * @return <code>true</code> if the popup button is currently
+   *         visible, <code>false</code> otherwise.
+   */
+  public abstract boolean isPopupVisible(JComboBox c);
+  
+  
+  /**
+   * Determines whether the combo box can receive input focus.
+   *
+   * @param c <code>JComboBox</code> whose focus traversability
+   *        is to be retrieved.
+   *
+   * @returns <code>true</code> if <code>c</code> can receive
+   *          input focus, <code>false</code> otherwise.
+   */
+  public abstract boolean isFocusTraversable(JComboBox c);
+}