Capture onselectedindex change from nested dropdownlist

[stretch73]

I have a repeater control with a DropDownList in the header template. I am trying to make a database call and sort the results by the selectedIndex property of the drop down. The SelectedIndexCh anged event is not getting fired, feel like I've tried everything.

Repeater Code
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<asp:Repeater ID="rptRecords " OnItemCreated=" rptRecords_OnIt emCreated" runat="server">
<HeaderTemplate >
<table class="bordered " Width="100%" align="center" cellpadding="2" >
<tr class="header_r ow">
<th class="h_12" colspan="19" align="left">
<asp:Label ID="lblTitle" Text="" CssClass="h_12" runat="server" />
</th>
</tr>
<tr>
<td colspan="19" align="right">
Sort by:&nbsp;
<asp:DropDownLi st
OnSelectedIndex Changed="ddlSor t_SelectIndexCh anged"
ID="ddlSort"
AutoPostBack="t rue"
runat="server">
<asp:ListItem Text="Project ID" Value="M.OBID" />
<asp:ListItem Text="Project Type" Value="ProjectT ype" />
<asp:ListItem Text="TPM Team" Value="TPMTeam" />
<asp:ListItem Text="Infrastru ctureType" Value="Infrastr uctureType" />
<asp:ListItem Text="Priority" Value="Priority " />
<asp:ListItem Text="Status" Value="Status" />
<asp:ListItem Text="Phase" Value="M.DMAIC" />
<asp:ListItem Text="Dispositi on" Value="Disposit ion" />
</asp:DropDownLis t>
</td>
</tr>
</HeaderTemplate>

Non working code
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protected void rptRecords_OnIt emCreated(objec t sender, RepeaterItemEve ntArgs e)
{
if (e.Item.ItemTyp e == ListItemType.He ader)
{
DropDownList ddlSort = (DropDownList)e .Item.FindContr ol("ddlSort");
ddlSort.AutoPos tBack = true;
ddlSort.Selecte dIndexChanged += new EventHandler(dr opDownList_Sele ctedIndexChange d);
}
}

protected void dropDownList_Se lectedIndexChan ged(object sender, EventArgs e)
{
RepeaterItem rptItem = (RepeaterItem)( ((Control)sende r).NamingContai ner);
DropDownList ddlSort = (DropDownList)r ptItem.FindCont rol("ddlSort");
m_SortExpressio n = ddlSort.Selecte dValue;
LoadData();
}