Hi,
do you mean something like this?
<?xml version="1.0" encoding="UTF-8"?>
<xp:view xmlns:xp="http://www.ibm.com/xsp/core">
<xp:listBox id="listBox1" multiple="true"
value="#{viewScope.selectedValues}">
<xp:selectItem itemLabel="1" itemValue="1"></xp:selectItem>
<xp:selectItem itemLabel="2" itemValue="2"></xp:selectItem>
<xp:selectItem itemLabel="3" itemValue="3"></xp:selectItem>
</xp:listBox>
<xp:br></xp:br>
<xp:br></xp:br>
<xp:listBox id="listBox2" value="#{viewScope.selectedValues}"
multiple="true">
<xp:selectItem itemLabel="1" itemValue="1"></xp:selectItem>
<xp:selectItem itemLabel="2" itemValue="2"></xp:selectItem>
<xp:selectItem itemLabel="3" itemValue="3"></xp:selectItem>
</xp:listBox>
<xp:br></xp:br>
<xp:br></xp:br>
<xp:button value="Label" id="button1">
<xp:eventHandler event="onclick" submit="true"
refreshMode="complete">
</xp:eventHandler>
</xp:button>
</xp:view>
If you click the button, the values selected in listBox2 will be selected in listBox1.
Hope this helps
Sven