public SynchObservableAction(Action oxBodyAction, IObservableProperty <bool> isAllowedObservable, string commandName)
: base(oxBodyAction, isAllowedObservable.GetValue, commandName)
{
_oxBodyAction = oxBodyAction;
_Cached_IsExecutingPropertyDescription = PropertyDescription.FromExpression <ISynchAction, bool>(x => x.IsExecuting);
}