title: NHibernate ICriteria - order by child collection count?
body: <p>Here is a simple example scenario -</p>
  
  <p>A 'Tag' has many 'Questions'. When I get a list of Tags how do I order by the Tags Question Count using the Criteria API?</p>
  
  <p>I have done this before but haven't touched NH in about 4 months and have forgotten... projections maybe? help!!!</p>
  
  <p>Thanks</p>