extjs4 grid点击单元格鼠标手形，修改背景色

extjs4让grid的单元格点击时支持手形。

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Ext.widget('gridpanel', {    title: 'grid',    height: 200,    width: 200,    renderTo: Ext.getBody(),    columns: [{        text: 'Col',        dataIndex: 'col',        renderer: function (val, metadata, record) {            if (record.get('col') == 1) {                metadata.style = 'background-color: #FFFFCC !important;cursor: pointer;'            }            return val;        },        listeners:{             "click":function(grid,cell,row){                      var r =  grid.store.getAt(row);              }       }    }],    store: {        fields: ['col'],        data: [{            col: 1        }, {            col: 2        }]    }})

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