/// <summary>
/// Display the initial progress message for the first cmdlet in the chain.<para/>
/// Returns an integer so that overridden instances of this method may support progress scenarios such as streaming
/// (where a "detecting total number of items" message is displayed before requesting the object totals.
/// </summary>
/// <returns>-1. Override this method in a derived class to optionally return the total number of objects that will be retrieved.</returns>
protected virtual int DisplayFirstInChainMessage()
{
int count = -1;
SetObjectSearchProgress(ProcessingOperation.Retrieving);
ProgressManager.DisplayInitialProgress();
return(count);
}