Sencha EXTJS and MVC pattern

I am coming up to speed on modifying 开发者_JAVA百科an application built in EXT,and I would like to use an MVC pattern with the overall architecture. Could someone point out how I can load views dynamically in EXT? For instance, to make a blind call to a controller that will return some kind of view that could be html, a grid, a window, etc...

I'm open to a javascript only solution, or one that calls and retrieves views from asp.net mvc.

thanks