iPhone:Add & Delete Row in UITableview with editing mode
<p>What I want to do is:</p>

<ol>
<li><p>Setting editing mode on NavigationBar in UITableView adds an <code>edit</code> button on the left side of the UINavigationBar.  When I click this button, I'd like an <code>add</code> button to appear on the right side of the NavigationBar.</p></li>
<li><p>When I click on the <code>add</code> button, add a row to the NSMutableArray and update the table.</p></li>
</ol>

<p>So please give me ideas, code, or links to develop this functionality.</p>
