Glad to hear it worked for you.

Another trick I've used, which may help you, depending on exactly what your trying to accomplish is to pass control from the activity to a function on the currently active page.. So, in my soundbridge (Similar to Slimpronto) activity, I detect a song change at the activity level, and then call the "SongChanged" function on whichever page is active... Something like this...

if (page().SongChanged != null) page().SongChanged();

On pages where I don't care if the song changed, I never declare the function, and it never gets called. And on pages where I do, I can take the appropriate action. This way, I can still keep all the specific page code at the page level, and easily pass control from the activity to the current page.