c# - How to access ObservableCollection nested in view model -


i have simple single window wpf app using mvvm. xaml binded mainviewmodel.cs class, contains observablecollection sites. sitemodel class has property named owners, contains second observablecollection companies.

i need bind companies property combobox in xaml. combobox nested in datagrid. situation described below.

<datagrid name="uxsitegrid" dockpanel.dock="top" itemssource="{binding sites, source={staticresource viewmodel}}" autogeneratecolumns="false"                margin="5,5,5,0" canuseraddrows="false" canuserdeleterows="true" canuserresizerows="false" canuserreordercolumns="false">         <datagrid.columns>             <datagridtextcolumn binding="{binding name}" header="name"/>             <datagridtextcolumn binding="{binding vseid}" header="vse id"/>             <datagridtextcolumn binding="{binding imo}" header="imo"/>             <datagridcomboboxcolumn selecteditembinding="{binding sitetype}" itemssource="{local:enumvalues rdsconfigconnector:sitetype}" header="site type"/>             <datagridtextcolumn binding="{binding timeperiod}" header="fetching period"/>             <datagridtextcolumn binding="{binding latitude}" header="latitude"/>             <datagridtextcolumn binding="{binding longitude}" header="longitude"/>             <datagridtextcolumn binding="{binding offsetlatitude}" header="offset latitude"/>             <datagridtextcolumn binding="{binding offsetlongitude}" header="offset longitude"/>               <datagridtemplatecolumn header="site owners">                 <datagridtemplatecolumn.celltemplate>                     <datatemplate >                         <combobox itemssource="{binding owners.companies}"/>                     </datatemplate>                 </datagridtemplatecolumn.celltemplate>             </datagridtemplatecolumn>          </datagrid.columns>     </datagrid>

the data-context inside datatemplate should site {binding owners.companies} should work (see e.g. here).
aware data-binding case-sensitive => may shoudl {binding owners.companies}?

if correct: did "binding error" in output window?


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