Simple Binding question, unable to bind to button command in a DataTemplate using MVVM Light Toolkit

I've been attempting to bind to buttons within a DataTemplate without much success. The button does not fire. Button Click works successfully outside of the DataTemplate. Yet if I create a Click="button_click" the click button is fired. The Button Content binds perfectly as well.

Example to illustrate..

Why does the command not fire? Advice on how this should be handled this? The example is a simplified version of my real problem, I am currently not using a Listbox开发者_高级运维. I only recreated the same problem with a listbox..

I asked the same question once before, came up with the answer myself, see this question:

How to connect a Button in a Silverlight ListItem DataTemplate, in a ResourceDictionary (Styles.xaml), with a handler?

The solution seems to be to use 'nested' ViewModels here:

In other words, rather than have my ListBox bind directly to a collection of DTOs/business objects (as I was doing above) I instead created a simple ViewModel to wrap each DTO, and have the command on it, rather than on the original, top-level VM.

This seem like a sln?