T5: How to do partial page rendering on my own beyond 5.0.6?

[Steven Woolley]

I was using code posted to the list (see http://www.nabble.com/T5%3A- 
Partial-Page-Rendering-td12179365.html) for partial page rendering.   
It worked wonderfully.  I could even render components that contain  
forms or grids.  However, starting with 5.0.7, PageRenderInitializer  
is gone (it wasn't internal either, mind you).  That's all well and  
good, except I have no clue how to accomplish this in anything since  
5.0.6.  Zones look promising, except they don't work with forms (or  
grids from what I've seen).  So, is there any middle ground?  I'd  
like to move up to newer versions, but this is a showstopper...

PageRenderInitializer initializer;
basically, it is just the
initializer.setup(markupWriter);

and
initializer.cleanup(markupWriter);

methods that were being used...  but it seems like there must be a  
way to still do this?

Steve