<xp:comboBox id="comboBox4" value="#{YourBeanName.yourVariableName}" style="width:158.0px"> <xp:selectItem itemLabel="Select Option" itemValue=""> </xp:selectItem> <xp:selectItems> <xp:this.value><![CDATA[#{javascript:YourBeanName.selectItems}]]></xp:this.value> </xp:selectItems> <xp:eventHandler event="onchange" submit="false"> </xp:eventHandler> </xp:comboBox>