The repeater itself won't add any automatic scrolling functionality. If you want to add scrolling functionality to your table, you will need to manually add the formatting to the table. For example, if you take a look at the HTML Repeater sample:
http://code.msdn.microsoft.com/windowsapps/HTML-Repeater-control-da22d278 and then modify/replace the scenario1.html with the following table, you should be able to get the desired scrolling:
<h2>HTML Repeater Control with <code>table</code> HTML element</h2>
<table class="table" style="width:375px;">
<thead class="table-header" style="display:block">
<tr>
<td style="width:50px;">Id</td>
<td style="width:300px;">Description</td>
</tr>
</thead>
<tbody class="table-body" data-win-control="WinJS.UI.Repeater" data-win-options="{data: Data.items}" style="height: 50px;overflow-y:scroll;display:block;">
<tr class="table-body-row">
<td style="width:50px;" data-win-bind="textContent: id"></td>
<td style="width:300px;" data-win-bind="textContent: description"></td>
</tr>
</tbody>
</table>
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