I have a toolbar in my application which is working just fine. It contains just buttons and separators. All of the buttons are left justified on the toolbar and they extend approx half way across the screen. I want to add a small JComboBox at the end of the buttons. However when I add this it always seems to stretch to fill the remaining width of the toolbar despite me setting both it's size and preferredsize. Any ideas on this one would be great - an example would be fabulous !