ActiveTabChanged Event Only Fires When TabContainer Control set to OnDemand="true"

Ajax Control Toolkit (Dec 2013).  ASP.NET Framework 4.5.

I am having a devil of a time getting the tabcontainer control to work as needed.  First, I found that only when OnDemand="false" does the JavaScript placed inside the <ContentTemplate> section of a tabpanel run.  Now I find that when I set OnDemand='false" so the JavaScript will run, the ActiveTabChanged event does not fire when the active tab changes.  I need to find a way to:

1.  Make JavaScript code run when OnDemand="true"

2.  Make ActiveTabChanged event fire even when OnDemand="false"