How to authenticate a CSOM call to SharepointOnline in code to Subsite of HostWeb (same site collection) with Lightswitch 2013

I am developing a Lightswitch 2013 (HTML) app.

I need to obtain list data from a subsite using CSOM.

I have no problem querying for the data in the hostweb using gethostwebclientcontext(); however, I can't seem to figure out how to change the clientcontext to the subsite context and be authenticated.

Please note that I have already selected Tenant Permissions. I have no problem with this in an MVC app, but can't seem to find a solution in Lightswitch HTML unless I make my call using HTML.

Jeff Childers