What will be the good solution in Rx.NET and/or ReactiveUI for this case: There is single MainDateTimeRange object and its StartDateTime and EndDateTime are observed by a number of objects-subscribers. When the period changes then the subscribers should refresh their data collection.
But the order of refereshing is important. First should be refereshed priority object-subscriber and after the others.
Priority object is the one which is currently shown in GUI and other are refreshed later in background.