Index: /trunk/src/org/openstreetmap/josm/gui/tagging/presets/items/Combo.java
===================================================================
--- /trunk/src/org/openstreetmap/josm/gui/tagging/presets/items/Combo.java	(revision 16308)
+++ /trunk/src/org/openstreetmap/josm/gui/tagging/presets/items/Combo.java	(revision 16309)
@@ -11,4 +11,5 @@
 import javax.swing.JButton;
 import javax.swing.JColorChooser;
+import javax.swing.JLabel;
 import javax.swing.JPanel;
 
@@ -104,4 +105,5 @@
             p.add(combobox, GBC.std().fill(GBC.HORIZONTAL));
             JButton button = new JButton(new ChooseColorAction());
+            button.setOpaque(true);
             button.setBorderPainted(false);
             p.add(button, GBC.eol().fill(GBC.VERTICAL));