private void On_BTN_Del_Click(object sender, RoutedEventArgs e)
{
GaoVM vm = LB_Gaos.SelectedItem as GaoVM;
if (vm != null)
{
int idx = LB_Gaos.SelectedIndex + 1;
_colle.Remove(vm);
GaoData.Data.DeleteData(vm);
LB_Gaos.SelectedIndex = idx;
}
}
