going to the top in UITableview doesn't work the second time

Question

Hello all , I have a question concerning the following issue. I would like to return to the top of my tableview everytime I press a cell

This is a piece of the code that does it.

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    ....
    ...
...
    [self.tableView setContentOffset:CGPointMake(0, 0) animated:NO];

Now I have a nextbutton (next video )

http://yfrog.com/0wpicture7qyp

And behind this button is this function

-(void)selectNextRow:(id)sender
{

    NSUInteger row = currentRowSelection.row;
    NSUInteger section = currentRowSelection.section;
    ++row;
    if(row >= [self.tableView numberOfRowsInSection:currentRowSelection.section])
    {
     row = 0;
     ++section;
     if( section >= [self.tableView numberOfSections])
     {
      row = 0;
      section = 0;
     }
    }


    [self.tableView selectRowAtIndexPath:[NSIndexPath indexPathForRow:row inSection:section] animated:YES scrollPosition:UITableViewScrollPositionBottom];

    [self tableView:[self tableView] didSelectRowAtIndexPath:currentRowSelection];


}

Now I would think that everytime I select a row the didSelectRowAtIndexPath would go to the top. However it only does this when I manually select a row and not when I use the function selectNextRow .. which as it says selects the next row. So my question is why is it doing this?