Problem of GridViewRow

[guo]

Hello,

var rowList = gridControl.ChildrenOfType<GridViewRow>();
var emloyeeRowList = rowList.Where(x => (x.DataContext is AppointmentInfo) && (x.DataContext as AppointmentInfo).EmployeeId == employeeId).ToList();

If emloyeeRowList.Count is 2,and i insert a same employeeId AppointmentInfo to the ItemsSource of the GridView.The emloyeeRowList.Count is still 2.

When is the emloyeeRowList.Count 3?  Or which event should i used to get the emloyeeRowList.Count 3？