Hi Jon,

While the above solution might work for the MS ContextMenu, the Infragistics one has an extra layer between the context menu and the placement target which interferes with things.  This extra layer means that the PlacementTarget property of the XamContextMenu is not actually set for you.  There is another property called PlacementTargetResolved which contains that placement target information.  This property is not a DependencyProperty and it does not implement INotifyPropertyChanged so binding to it is not helpful.  You will only see null from this because when the binding is initially evaluated, the PlacementTargetResolved is null.  Even when the value is changed later on, the binding won't update and you'll still be bound to null.

To get around this I wrote a very simple behavior that you can attach to the context menu.  It simply handles the Opened event and takes the DataContext from the PlacementTargetResolved property and passes it to the XamContextMenu. 

public class PassDataContextToContextMenu : Behavior<XamContextMenu>
{
    protected override void OnAttached()
    {
        AssociatedObject.Opened += AssociatedObject_Opened;
    }
    protected override void OnDetaching()
    {
        AssociatedObject.Opened -= AssociatedObject_Opened;
    }

    void AssociatedObject_Opened(object sender, OpenedEventArgs e)
    {
        // when the context menu is opened, update the data context... Just in case the PlacementTargetResolved has changed
        FrameworkElement placementTarget = (FrameworkElement)AssociatedObject.PlacementTargetResolved;
        AssociatedObject.DataContext = placementTarget.DataContext;
    }
}

<ig:XamContextMenu Placement="AlignedToTheRight">
    <i:Interaction.Behaviors>
        <b:PassDataContextToContextMenu/>
    </i:Interaction.Behaviors>
                                        
    <ig:XamMenuItem Header="...to Text" Command="{Binding ConvertToTextCommand}"/>
</ig:XamContextMenu>