Iscroll 4 - How to scroll to a particular element based on some id?

Question

I am using iScroll Lite base on iScroll v4.1.6 in my project and this scrolling is working perfectly fine. My structure for iscroll is given below:

<article id="contentWrapper">
    <div id="contentScroller">
           <table cellpadding="0" cellspacing="0" width="100%">
                    <TBODY>
                        <tr class="datatable_row" id="1">
                              <td width="10%">13/02/2013</td>
                     <td class="narration" width="28%">Chq paid</td>
                </tr>
                        <tr class="datatable_row" id="2">
                               <td>16/02/2013</td>
                    <td class="narration">Chq paid</td>
                 </tr>
                   </TBODY>
          </table>
    </div>
</article>  

And the Javascript code for Iscroll apply is given below:

var scrollContent;

function loaded() {
    scrollContent = new iScroll('contentWrapper');

}

document.addEventListener('touchmove', function (e) { e.preventDefault(); }, false);

document.addEventListener('DOMContentLoaded', loaded, false);  

Now you can see that there are so many <tr> elements in my table which are coming dynamically having an id. Now suppose I want to scroll to <tr> which has id 7 . How can I do this?

I tried the following, but it's not working:

scrollContent.scrollToElement("#7", "1s");   

Giving error in console, which is:

Uncaught SyntaxError: Failed to execute query: '#7' is not a valid selector.

Please let me know how to scroll to a particular id using Iscroll.