Index: /trunk/src/org/openstreetmap/josm/gui/bbox/SizeButton.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/gui/bbox/SizeButton.java	(revision 8397)
+++ /trunk/src/org/openstreetmap/josm/gui/bbox/SizeButton.java	(revision 8398)
@@ -1,4 +1,6 @@
 // License: GPL. For details, see LICENSE file.
 package org.openstreetmap.josm.gui.bbox;
+
+import static org.openstreetmap.josm.tools.I18n.tr;
 
 import java.awt.Dimension;
@@ -27,5 +29,4 @@
 
     public SizeButton(SlippyMapBBoxChooser slippyMapBBoxChooser){
-        super();
         this.slippyMapBBoxChooser = slippyMapBBoxChooser;
         enlargeImage = ImageProvider.get("view-fullscreen");
@@ -33,4 +34,5 @@
         setPreferredSize(new Dimension(enlargeImage.getIconWidth(), enlargeImage.getIconHeight()));
         addMouseListener(mouseListener);
+        setToolTipText(tr("Enlarge"));
     }
 
@@ -44,5 +46,4 @@
         }
     };
-
 
     @Override
@@ -59,4 +60,5 @@
     public void toggle() {
         isEnlarged = !isEnlarged;
+        setToolTipText(isEnlarged ? tr("Shrink") : tr("Enlarge"));
     }