- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
        // disable touch on expanded cell
    UITableViewCell *cell = [self.theTableView cellForRowAtIndexPath:indexPath];
    if ([[cell reuseIdentifier] isEqualToString:@"ExpandedCellIdentifier"]) {
        return;
    }

        // deselect row
    [tableView deselectRowAtIndexPath:indexPath
                             animated:NO];

        // get the actual index path
    indexPath = [self actualIndexPathForTappedIndexPath:indexPath];

        // save the expanded cell to delete it later
    NSIndexPath *theExpandedIndexPath = self.expandedIndexPath;

        // same row tapped twice - get rid of the expanded cell
    if ([indexPath isEqual:self.expandingIndexPath]) {
        self.expandingIndexPath = nil;
        self.expandedIndexPath = nil;
    }
        // add the expanded cell
    else {
        self.expandingIndexPath = indexPath;
        self.expandedIndexPath = [NSIndexPath indexPathForRow:[indexPath row] + 1
                                                    inSection:[indexPath section]];
    }

    [tableView beginUpdates];

    if (theExpandedIndexPath) {
        [_theTableView deleteRowsAtIndexPaths:@[theExpandedIndexPath]
                             withRowAnimation:UITableViewRowAnimationNone];
    }
    if (self.expandedIndexPath) {
        [_theTableView insertRowsAtIndexPaths:@[self.expandedIndexPath]
                             withRowAnimation:UITableViewRowAnimationNone];
    }

    [tableView endUpdates];

        // scroll to the expanded cell
    [self.theTableView scrollToRowAtIndexPath:indexPath
                             atScrollPosition:UITableViewScrollPositionMiddle
                                     animated:YES];
}

- (IBAction)expand:(id)sender {

}