private void Border_RightTapped(object sender, RightTappedRoutedEventArgs e)
{
selectItem = (sender as Border).DataContext as Atten_channel;
menu.ShowAt(sender as Border);
}
private void Border_Holding(object sender, HoldingRoutedEventArgs e)
{
selectItem = (sender as Border).DataContext as Atten_channel;
menu.ShowAt(sender as Border);
}
