Preferable way to switch language syntax part SyntaxEditor

I have one editor user window with the WPF Syntax editor in it with one language definition. I will need later the be able to switch the language on the fly when the user selects one of our flavor of languages. So what's the best way to do this?

Setup a different user control with each language flavor and flip the controls in and out.
Dynamically reset the language part of one syntax editor if possible?
Other?

Thanks,
Bernie