Need help with casting

   My code calls a Coroutine which performs a couple of queries and calculations and finally returns 

Ideablade.EntityModel.CoRoutineOperation. Which in this case is assigned to step in the following piece of code.

var steps = Coroutine.Start(() => AvailableStepsSelector.RetrieveAvailableSteps(currentEvent));

steps.Completed += (sender, args) => {
if (args.CompletedSuccessfully) {

    var type = steps.Result.GetType();          // type = Ideablade.EntityModel.EntityQueryOperation [EventStepType]

    var results = steps.Result as IEnumerable<EventStepType>;  // before the assignment 25 rows --- after null

    ResetStepTypesList(results);
}

When I do a GetType() on steps.Result, I get an Ideablade.EntityModel.EntityQueryOperation [EventStepType], which is fine. On the very next line I cast steps.Result as IEnumerable<EventStepType> and the assign it to results, thinking that results will now hold the returned data. WRONG, it is null. My ultimate goal is to pass results to ResetStepTypesList where I will do the following

public void ResetStepTypesList(IEnumerable<EventStepType stepTypes)
{
   StepTypes.Clear();                    //StepTypes is an ObservableCollection of EventStepType
   StepTypes.ForEach(results.Add);
}

What am I doing wrong here between steps.Result and var results?