title: Filtering items in a column in Ext.grid.EditorGridPanel
body: <p>I have an Ext.grid.EditorGridPanel in which I defined several columns.</p>
  
  <p>Per each of the columns, I would like to allow the user to select a subset of items and then present only the rows that contain the selected values.</p>
  
  <p>I thought of something similar to Excel's filter option.</p>
  
  <p>I could not find a method that suits my needs in the Ext 3.3.1 API documentation but I am very new to this so it is quite possible I missed it...</p>
  
  <p>Is there a simple way to do this?</p>
  
  <p>Thanks!!!</p>