xml - How to Parse nodes in datasource return using XAML DataGrid? -

i have odd return webservice proving difficult bind datagrid. here being returned webservice:

<new0collection> <new0item>     <orno>0010121825</orno>     <!-- xml data encoded -->     <ponr>&lt;obponr&gt;1&lt;/obponr&gt;&lt;obponr&gt;2&lt;/obponr&gt;&lt;obponr&gt;3&lt;/obponr&gt;</ponr> </new0item> 

there limitation on our system have encode nested nodes. trying list within list, have been able in datalist rowtemplate. user selects line in datagrid, , sub-list of related items shown.

<datagrid name="prodlines_list3" verticalalignment="stretch" horizontalalignment="stretch" itemssource="{binding  new0collection}" rowdetailsvisibilitymode="{binding elementname=expandrows_txt,path=text,mode=oneway}" style="{dynamicresource styledatagrid}" headersvisibility="all" autogeneratecolumns="false" rowheaderwidth="0" canusersortcolumns="true" canuserresizerows="false" canuseraddrows="false" canuserdeleterows="false" verticalgridlinesbrush="#50e5e5e5" horizontalgridlinesbrush="#50e5e5e5" horizontalcontentalignment="center" rowheight="25" height="auto" width="auto" grid.row="1" grid.column="0">     <datagrid.resources>         <datatemplate x:key="expanderbt">             <stackpanel orientation="horizontal">                 <checkbox x:name="expandrows_check" content="row mode:" ischecked="{x:null}" isthreestate="true" margin="5" fontsize="14" />                 <textbox x:name="expandrows_txt" text="{binding elementname=prodlines_list,path=rowdetailsvisibilitymode,mode=twoway,updatesourcetrigger=propertychanged}" />             </stackpanel>         </datatemplate>     </datagrid.resources>     <datagrid.rowdetailstemplate>         <datatemplate>             <listbox x:name="operations_listbox" itemssource="{binding ponr}" width="auto" verticalalignment="top" horizontalalignment="stretch" margin="20,0,0,0" maxheight="200">                 <listbox.itemtemplate>                     <datatemplate x:name="operations_items">                         <dockpanel x:name="itemdockpanel" background="#c5c5c5">                             <textblock x:name="voopno_txt" text="{binding}" margin="3,3,3,3" verticalalignment="center" horizontalalignment="left" dockpanel.dock="left" />                         </dockpanel>                     </datatemplate>                 </listbox.itemtemplate>             </listbox>         </datatemplate>     </datagrid.rowdetailstemplate>     <datagrid.columns>         <datagridtextcolumn header="order" binding="{binding orno}" />         <datagridtextcolumn header="line" binding="{binding ponr}" />     </datagrid.columns> </datagrid> 

you can see ponr nodes displaying xml code, , getting every character displayed listboxitem in row template.

although should this:

(this datagrid works, because data not being returned webservice)

is there better way format web-service data, or there binding trick use?