JComboBox itemStateChanged gets called twice.

Hi i have a JComboBox whoes itemStateChanged gets called twice. I have taken a look at other post concerning this topic and non have worked for me . I will greatly appreciate it if someone can help me
here is the code !!!!!!!!!!
jComboBox3.addItemListener(new ItemListener(){
public void itemStateChanged(ItemEvent e) {
if(e.getStateChange() == e.SELECTED){
jComboBox3_dosomething(e);
thanks in advance

Maybe this thread will answer why it gets called twice:
http://forum.java.sun.com/thread.jsp?forum=57&thread=257226

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http://java.sun.com/j2se/1.3/docs/api/java/awt/event/ItemListener.html
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                            <af:selectOneChoice value="#{bindings.CompanyName.inputValue}"
                                                required="#{bindings.CompanyName.hints.mandatory}"
                                                shortDesc="#{bindings.CompanyName.hints.tooltip}"
                                                id="soc1" autoSubmit="true"
                                                unselectedLabel="--select--"
                                                contentStyle="width:17em;"
                                                binding="#{backingBeanScope.backing_Company.soc1}"
                                                valueChangeListener="#{backingBeanScope.backing_Company.companyChangeListener}">
                              <f:selectItems value="#{bindings.CompanyName.items}"
                                             binding="#{backingBeanScope.backing_Company.si1}"
                                             id="si1"/>
                            </af:selectOneChoice>

JComboBox itemStateChanged gets called twice.

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