Hi,
here is a tranformation example with datalist nested control which display nested articles. It display the page document and list of articles under this node. You need to set property of repeater -
Nested control ID. In this case it would be CMSDataList1.
page
--article
<strong><a href="<%# ResolveUrl(GetUrl( Eval("NodeAliasPath"), null)) %>">
<%# Eval("DocumentName") %></a></strong>
<br />
<cc1:CMSDataList ID="CMSDataList1" runat="server" ClassNames="cms.article" Path='<%# Eval("NodeAliasPath") %>'
TransformationName="cms.article.default" RepeatColumns="2" >
</cc1:CMSDataList>
<script runat="server">
protected void Page_PreRender(object sender, EventArgs e)
{
CMSDataList1.ReloadData(true);
}
</script>