TIWTemplateProcessor - at runtime

I have a situation where I would like to use  TIWTemplateProcessor in a region, but be able to change the template applied based on a runtime condition (order type) set when user sets a value or in an onscroll event. 

In the past, before I got wise to templates, I would stack the regions and just show the one I wanted, but with templates, I can just expose the controls needed based on the type of order

What is best way to force the region to repaint using the updated template?


Thanks
- Lou