How do I set CommandParameter in XAML?

Question

I have the following XAML:

Answer 1

I believe it should be this

<dxg:GridControl Name="theGrid" DataSource="{Binding Path=Groupings}">
  <dxg:GridControl.ContextMenu>
    <ContextMenu>
      <MenuItem x:Name="gridprint"
        Command="{Binding Path=GridPrintCommand}"
        CommandParameter="{Binding ElementName=theGrid}"
      />
    </ContextMenu>
  </dxg:GridControl.ContextMenu>

Answer 2

Try using this:

<MenuItem x:Name="gridprint"
    CommandParameter="{Binding PlacementTarget, RelativeSource=
         {RelativeSource FindAncestor, AncestorType={x:Type ContextMenu}}}" />

ContextMenus are not part of the WPF's normal VisualTree, so you have to bind using the PlacementTarget to get the object the ContextMenu is attached to