title: Gxt: gridview with row header
body: <p>I'm very new to GXT and webapp.</p>
  
  <p>I have created a class that extends GridView, I can configure the number of columns, the columns header and display some rows, it works.</p>
  
  <p>I would like to add a header for each rows, this header should have the same look and feel as the column header (I would like to get a table similar to an Excel sheet).</p>
  
  <p>I cannot find any information about this, Is there're a way to add a row header? Is there a tutorial or some examples?
  Thanks for your help</p>