At least one object must implement IComparable. - Sorting a GroupedCollection with Linq

I have the following structures as example:

class ServicesGroup : IServicesGroup, IComparable
      public string CityName { get; set; }
      public ObservableCollection<Service> Services { get; set; }
      public int CompareTo(object obj)
        ServicesGroup sg = (ServicesGroup)obj;

        return String.Compare(this.CityName, sg.CityName);

I am trying to sort my collection of Services at each group by its [ServiceId] (ascending and descending):

tempCollection = new ObservableCollection<object>(collection.OrderBy(x => ((ServicesGroup)x).Services.OrderBy(y => y.ServiceId)));

My Service class implements IComparable as well:

I tried both
public class Service : IComparable, IEquatable
public class Service : IComparable<Service>, IEquatable<Service>

Example of my Service class:

public class Service : IComparable, IEquatable
            public string ServiceId {get; set;}

        public string ServiceType {get; set;}
            public int CompareTo(object obj)
            Service s = (Service)obj;

            return String.Compare(this.ServiceId, s.ServiceId);
            public bool Equals(Service other)
            if (this.ServiceId.Equals(other.ServiceId) && this.ServiceType.Equals(other.ServiceType)) return true;
            return false;

When I try to run my linq I get the following error:

Additional information: At least one object must implement IComparable.

I can not access the [public ObservableCollection<Service> Services] for some reason. What am I missing here?
Alejandro AcevedoSr. [.NET] Developer/Systems Analyst/ConsultantAsked:
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Jacques Bourgeois (James Burger)PresidentCommented:
You are defining your collection as a collection of Object

     tempCollection = new ObservableCollection<object>

The Object does not implements IComparable, thus your error. And you should never use Object when you work with a known specific type. Try

     tempCollection = new ObservableCollection<ServicesGroup >

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Alejandro AcevedoSr. [.NET] Developer/Systems Analyst/ConsultantAuthor Commented:
Thank you so much for your help James
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