title: How to make a non-alphabetical sectionindexer
body: <p>In my search activity I am pulling data from 4 <code>Cursors</code> (each with a tag saying what it contains) placed in a <code>MergeCursor</code>. What I'd like to is create a section indexer which allows the user to move between these sections, instead of the usual alphabetical one. How should I go about doing this? </p>
  
  <p>Thanks</p>