I was using the row expander function in the extjs 2.0 library. When I moved over to 3.4 I noticed that this function was no longer there.

My code currently includes this in a .jsp file
Code:
<script type="text/javascript" src="lib/ext-3.4.0/examples/grid/RowExpander.js"></script>
And then I declare in a .js file

Code:
expander = new Ext.grid.RowExpander({
        tpl : new Ext.Template('<br><p><b>Previous Value:</b> {previousValue}<br><br>', '<p><b>New Value:</b> {newValue}<br><br>')
    });
Is there an equivalent to this in 3.4? If not, what do I convert this into?