Pluggable look and feel interface for ComboBox.
Subclass shoud override the three method of this class.
new ComboBoxUI()public function setPopupVisible(c:JComboBox, v:Boolean):VoidSet the visiblity of the popup
public function isPopupVisible(c:JComboBox):BooleanDetermine the visibility of the popup
public function isFocusTraversable(c:JComboBox):BooleanDetermine whether or not the combo box itself is traversable