使用synth遇到的问题

Question

我在开发时对自定义了个新的jcombobox，类名为CustomCombo，但是还想使用和其他jcombobox使用同样的风格化，请问xml文件要如何写？
jcombobox风格化代码
<style id="comboBoxStyle">
        <opaque value="TRUE"/>
        <state>
            <imagePainter method="comboBoxBorder" 
                          path="images/combobox_border.png"
                          sourceInsets="2 2 2 2" 
                          paintCenter="false"/> />
        </state>
        <state value="FOCUSED">
            <imagePainter method="comboBoxBorder" 
                          path="images/combobox_border_focus.png"
                          sourceInsets="2 2 2 2" 
                          paintCenter="false"/> />
        </state>
        <insets top="2" left="2" bottom="2" right="2"/>
    </style>
    <bind style="comboBoxStyle" type="region" key="ComboBox"/>