Here is an example that uses MMVM Light from GalaSoft
However, .NET SDK is not strategic and if you are tapping different APIs, I would suggest you look into the HTML5 SDK that has more functionality.
I don't think I quite follow what you're asking. Would you mind elaborating? What do you mean by "framework"? Eikon is a very feature rich fat client product. It has a long history of predecessors, and has been built over time on a mixture of technologies. There's no single "framework" that it follows, unless you're asking about some specific component of Eikon, which may be utilizing a single technology.