lookupReference Controller

lookupReference 获取得到null,未指定视图控制器ViewController，

// itemId ='grid-xsT_cashFlow-financeDept' 以下两种方式结果相同

this.up('window').down('#grid-xsT_cashFlow-financeDept');

this.up('window').getComponent('grid-xsT_cashFlow-financeDept');