silverlight - Listboxes hierarchy -

i have 3 embedded listboxes entities: group, item, subitem.

<listbox name="groupitemslistbox"          itemsource="{binding entitygroups"}>     <listbox.itemtemplate>         <datatemplate>             <itemscontrol name="itemslistbox"                           itemsource="{binding items}">                 <itemscontrol.itemtemplate>                     <datatemplate>                         <itemscontrol name="subitemslistbox"                                       itemsource="{binding subitems}">                             <itemscontrol.itemtemplate>                                 <datatemplate>                                     <textblock text="{binding name} />                                 </datatemplate>                             </itemscontrol.itemtemplate>                     </datatemplate>                </itemscontrol.itemtemplate />             </itemscontrol>         </datatemplate>      <listbox.itemtemplate> </listbox> 

also there case when last listbox empty. want handle selecteditem lowest existing itemcontrol. able manage when specific object selected.

for example when click on itemgroup[1].items[0].subitem[2] want element, not itemgroup[1] or itemgroup[1].items[0].

how can achieve it?

use longlistselector instead. supports grouping in nicer way.