I have Dropbox working with an app, and now I want to implement it in a data interface (i.e. IDataService) so that other choices will be possible. i.e. on the first screen the user clicks on "Connect to Dropbox" button (which I had working on it's own), or "use local files" button (which would then direct to a file-picker, which is what I'm wanting to add next), or whatever. Can someone point me to a working example of something similar on github or where-ever so that I can have a browse of the code? I've nearly got it working, but there's something I'm missing (knowledge-wise). Thanks.