title: attr data-bind for an observable does not update in Knockout.js
body: <p>I have bound an observable from my view model to the title of a div like so:</p>
  
  <p></p>
  
  <p>area is a ko.observable()</p>
  
  <p>When the value is set the first time, the title updates correctly. Any further updates to area do not result in a title update.
  I know that the value sets properly because I added a span bound to the same and that updates just fine:
  </p>
  
  <p>Not sure what I am missing.</p>
  
  <p>Update: Sorry, I guess I was doing a stupid thing. I was using the jQueryUI modal dialog and instead of setting the title of the dialog, I was setting the containing div title...which of course, is wrong. </p>