title: How to add a collection-bound select box to a form in Backbone.Marionette?
body: <p>I have a member form in which there is a select box for choosing a group of this member.</p>
  
  <p>I'm using Backbone &amp; Backbone.Marionette. The member form is bound to a MemberModel. Data for the select box comes from a GroupCollection. MemberModel contains only a group_id, not any reference to a GroupCollection.</p>
  
  <p>I'm now generating this select box manually (fetch GroupCollection then add  to select box by using Javascript). </p>
  
  <p>I would like to know if there is a better way to do it in Backbone.Marionette. I thought it could be done with ListView and ItemView but I couldn't know how to add the select box to this Member form because this form is not a Layout.</p>