Get Source Type checkboxes working on Index page

[bobharner]

The "Source Type" checkboxes on the index page don't work yet, and never have.

I'm using the checklist component copied from Tapestry 5.3.

The current problem: for some reason the sourceTypeService field is null within SourceTypeEncoder, as though Tapestry isn't bothering to inject the service when (I think) it should. But this same SourceTypeEncoder works fine on the EditEntry page.

[bobharner]

I have this working with a "Go" button, but still need to change over to submitting the form ajax-style via javascript:

$(formId).fire(Tapestry.FORM_PROCESS_SUBMIT_EVENT)