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How come in some classes I have to specify this constructor to get the callback to be invoked?
_timer = new DispatcherTimer(DispatcherPriority.Normal, Application.Current.Dispatcher);
Instead of just:
_timer = new DispatcherTimer();
The default constructor will use the current Dispatcher instead of the current application’s Dispatcher. If this is called on a thread other than the UI thread, the first overload is required in order to get the correct synchronization context.