Validation plugin used together with mapping plugin

Hey
Do you have any code samples bow to use your plugin with the mapping one found here: http://knockoutjs.com/documentation/plugins-mapping.html

I am able to extends the properties the mapping plugin creates but when I call isValid on my object it says thank function does now exist.
The question is how does your validation plugin add function isValid to my object?

Thanks

Start by reading the Knockout Validation plugin documentation alongside the Knockout Mapping plugin documentation linked in the issue, focusing on how isValid is added to mapped objects. Reproduce the reported integration case and document a working code sample, including the conditions under which isValid is available.

Written by the indexing model from the issue text.