silverlight 4 RIA update item in domaindatasource only updates after refresh

Question

Hi there, I have created a silverlight app and have a listbox that is populated using a domaindatasource. I have created a button that takes the selected list item and updates a field (in my case its called IsDeleted) my domain service looks like this

  public IQueryable<Employee> GetEmployees(int storeID)
    {
        return this.ObjectContext.Employees.Where(e=>(e.StoreID==storeID)&&(e.IsDeleted==false));
    }

In my button event I am doing this

    EmployeeRecord.IsDeleted = true;
                        dsEmployee.SubmitChanges();

The database is been updated as expected until the application is reloaded or I F5 than I don't see the update. What else should I be doing to see the update straight away?