valueChangeListener method called only once

[Gregg Bolinger]

On my form I have 3 selectOneMenu's.

category
subCategory
subSubCategory

When category is changed, I call changeCategory(ValueChangeEvent event).  When subCategory is changed I call changeSubCategory(ValueChangeEvent event).

I have noticed that when changeCategory is called, changeSubCategory is also called.  I know why this happens.  That is fine.  However, afterwhich, I change the subCategory select and changeSubCategory is not called again.  Any suggestions?

<t:outputText value="Category" />
                    <t:selectOneMenu id="catSelect" value="#{ArticleListBean.category}" valueChangeListener="#{ ArticleListBean.changeCategory}">
                        <f:selectItem itemLabel="ALL" itemValue="0" />
                        <f:selectItems value="#{ArticleListBean.catList }" />
                    </t:selectOneMenu>

                    <t:outputText value="Sub-category" />
                    <t:selectOneMenu id="subCatSelect" value="#{ ArticleListBean.subCategory}" valueChangeListener="#{ArticleListBean.changeSubCategory}">
                        <f:selectItem itemLabel="ALL" itemValue="0" />
                        <f:selectItems value="#{ ArticleListBean.subCatList}" />
                    </t:selectOneMenu>

public void changeCategory(ValueChangeEvent event)
    {
        setCategory((Integer)event.getNewValue());       
    }

    public void changeSubCategory(ValueChangeEvent event)
    {
        setSubCategory((Integer)event.getNewValue());       
        System.out.println("################### " + getSubCategory());
   }