title: add tooltip to extjs grid to show complete information about that row
body: <p>I had a <em>gridview</em>, it attached with a model that have some fields. But in my grid i just show one field, and what i want is when my mouse hover to the grid row, <em>tooltip</em> will appear and show the other fields value. </p>
  
  <p>How can i do this? Anybody ever done this?</p>
  
  <p>What grid event that I should create the <em>tooltip</em>? How can I access my on hover row value and show it on the <em>tooltip</em>? How the nice ways to show the value, can <em>tooltip</em> using item like <em>xpanel</em> or something, or the only way is using html? </p>
  
  <p>Please help me. Thanks in advance :)</p>