title: how to activate section Index Titles For Table View
body: <p>this is my first question here..</p>
  
  <p>I have a tableview setting with numberOfSectionsInTableView=6, which has also custom created cells.
  I am trying to use 'section index title' with some predefined titles . I have gone through sample code and following the same.
  I'm able to show section index title from my tableview by using function 'sectionIndexTitlesForTableView'. 
  But to activate that, i don't know how to make it work when i clicked on some title. Let me want to move to the page based on title selection.
  For example, same like how built-in Contacts(address book) works.</p>
  
  <p>I'm on MAC OS X 10.7 lion (beta)
  using XCode 4.2 iOS SDK 5.0</p>