Ext.grid.GridPanel 问题

Ext.ux.myGrid = Ext.extend(Ext.grid.GridPanel, {...}); 
s.each(function(r){ 
      if(r.get('state')=='S'){ 
            alert(r.get('state'));               
             //请问这里如何使用grid对象getView().getRow(girdcount).style.backgroundColor='#FFFF00'; 
     }});