Vista - templates and tabindex

If I have templated a contol, a button for example, to contain 2 text boxes
and set the TabIndex on those 2 text boxes to 1 and 2 respectively only the
lesser tab index is focused. I suspect that avalon is treating the control
as a single element and so will only get focus once and has to choose a
control from the template that will actually get focus, but are there any
options to have multiple focus points inside a single element?

Jason