Ext.grid.GridPanel 問題

Ext.ux.myGrid = Ext.extend(Ext.grid.GridPanel, {...});
s.each(function(r){
      if(r.get('state')=='S'){
            alert(r.get('state'));
             //請問這裏如何使用grid對象getView().getRow(girdcount).style.backgroundColor='#FFFF00';
     }});