title: Ext.grid.Panel get selected record from tbar button
body: <p>I created a View extend Ext.grid.Panel and also attach a tbar to it, in the toolbar I got 2 buttons [Add] and [Remove] in this question I am focus on the [Remove] command only.</p>
  
  <p>As usual I want to get hold to current selected record in the grid which I want to delete.</p>
  
  <p>so in the controller:</p>
  
  <pre><code>init: function() {
   this.control({
     'extendgridlist button[action=remove]': {
        click: this.removeCurrentRow;
      }
   });
  }
  
  removeCurrentRow: function(t){
   // how do i get current selected record
  }
  </code></pre>