if  (!Ext.grid.GridView.prototype.templates) {      
    Ext.grid.GridView.prototype.templates = {};      
}      
Ext.grid.GridView.prototype.templates.cell =  new  Ext.Template(      
     '<td class="x-grid3-col x-grid3-cell x-grid3-td-{id} x-selectable {css}" style="{style}" tabIndex="0" {cellAttr}>' ,      
     '<div class="x-grid3-cell-inner x-grid3-col-{id}" {attr}>{value}</div>' ,      
     '</td>'      
);