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Clicking on the arrow when the menu is already open should close it.
it seems vstejskal already fixed this http://openide.netbeans.org/source/browse/openide/awt/src/org/openide/awt/DropDownButton.java?r1=1.1&r2=1.2
Yes, sorry, I didn't know about this issue. I also changed the way how the arrow is added to the button's icon, the motivation was to make the default implementation for greying out icons in disabled buttons work. This default implementation applies GrayFilter on Image, hence it only works for ImageIcons.
Regarding ImageIcon, I filed issue #104530.
The same for DropDownToggleButton. Checking in DropDownToggleButton.java; /cvs/openide/awt/src/org/openide/awt/DropDownToggleButton.java,v <-- DropDownToggleButton.java new revision: 1.3; previous revision: 1.2 done