keyboard no longer stays active when returning from a ListPicker

Hi Evan, thanks for you pull request.

I see a little issue with style. It's not about the code, really, but about how we do things in other components.
We generally avoid doing extra work in the constructor; we register **this** as the component itself and override the method within the component class. I haven't really tested the code, but we like being consistent when writing new code. Does that make sense?