Question

I have a ContextMenu (from the Silverlight Toolkit) inside a DataTemplate used as the ItemTemplate of a ListBox:

<DataTemplate x:Key="BillItemDataTemplate">
  <Grid Margin="0,0,0,12" x:Name="ItemGrid">
    <kit:ContextMenuService.ContextMenu>
      <kit:ContextMenu>
        <kit:MenuItem Header="delete item" 
                      Command="{Binding ???????.DeleteItemCommand}"
                      CommandParameter="{Binding}" />
      </kit:ContextMenu>
    </kit:ContextMenuService.ContextMenu>
    [...]
  </Grid>
</DataTemplate>

How can I tell the ContextMenu.Command to bind to a property on the view-model exposed by the outer DataContext (i.e. the one that applies to the ListBox)? If I’m right, I cannot use WPF relative declarations as explained here.

I would prefer if my child view-models wouldn’t require a reference to the “parent” view-model.

Answer 1

For the record, I’ve taken the habit of having an ICommand property on every child view-model, set to the parent ICommand when each is created, again with CommandParameter="{Binding}".