Passing BO parameter to VM

This code in my MainPage:

Bxf.Shell.Instance.ShowView(typeof(Views.ProgrammeNetworkList).AssemblyQualifiedName, "programmeNetworkListViewSource", new ViewModels.ProgrammeNetworkList(myId), "Dashboard");

loads the View, but does not populate the grid with data, with this code in my ViewModel:

public ProgrammeNetworkList(int id)

{ BeginRefresh(callback =>NGIS.Business.ProgrammeNetworkList.GetProgrammeNetworkList(id, callback)); }

I must be missing something, please guide?

ProgrammeNetworkList is a ReadOnlyList

Thanks