ajaxChildComboBox why two methods that return SelectItem array

[Michael Ageeb <mi...@acm.org>]

Hello,
   I'm trying to use the ajaxChildComboBox and i found in the examples that
it is using two methods to return the same data one in bind  as a tag
parameter "ajaxSelectItemsMethod" and another one as a normal f:selectItems.

in other words what is the purpose of the bold methods

<s:ajaxChildComboBox value="#{ajaxChildComboBoxBean.selectedCity}"
parentComboBox="parentCombo"
                             ajaxSelectItemsMethod="#{
ajaxChildComboBoxBean.getCitiesOfSelectedCountry}">
            <f:selectItems value="#{ajaxChildComboBoxBean.cities}"/>
        </s:ajaxChildComboBox>

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