Modx Resource List as checkbox for users

Please help, I am stuck with Modx Revo tv input type options.

What I want to achieve is have a checkbox type tv, that displays the resources of a particular parent as checkbox items. So when user checks an item or two, they will be outputted as comma separated values.

Than I will put my tv in a getresources call on the template and it will output some information form the checked resources.

So how do I convert resource list into checkbox options?

The documentation on this is very ambiguous.