No scheduler on a tab?

I set up a demo of the scheduler for a new application. I had everything working just fine, but then decided that I wanted to put the scheduler on a tab in a tab container. (I'm using .net 4.0 presently)

When I do this, I get an error:

TabContainer cannot have children of type 'DayPilot.Web.Ui.DayPilotScheduler'.

Again, the control works fine when it is in a regular update panel, so what gives?

Thanks!

Mike