/// <summary>
/// Initializes a new instance of the <see cref="DataFedVM"/> class.
/// </summary>
protected DataFedVM()
{
ControlsThatCurrentlyRequireThisVM = new ObservableCollection<object>();
ObservationState = new BehaviorSubject<ObservationState>(Common.Models.ObservationState.Suspended);
//Sets up ObservationState to turn Active when there are >0 controls that require this VM
//and inactive when there are 0 controls that require this VM
ControlsThatCurrentlyRequireThisVM.FromCollectionChanged()
.Select(args => ControlsThatCurrentlyRequireThisVM.Count > 0 ? Common.Models.ObservationState.Active : Common.Models.ObservationState.Suspended)
.DistinctUntilChanged().Subscribe(state => ObservationState.OnNext(state));
//Setup IsLoading property
_isLoading = IsLoadingSubject.ToProperty(this, x => x.IsLoading);
}