dropdownlist not firing

Hi all,
I have the following Dropdownlist box which doesnt go into the  ddlFy_SelectedIndexChanged event in code behind...

<asp:DropDownList ID="ddlFy" runat="server"
        onselectedindexchanged="ddlFy_SelectedIndexChanged">
          <asp:ListItem>2008/2009</asp:ListItem>
          <asp:ListItem>2009/2010</asp:ListItem>
          <asp:ListItem>2010/2011</asp:ListItem>
          <asp:ListItem>2011/2012</asp:ListItem>
          <asp:ListItem>2012/2013</asp:ListItem>
          <asp:ListItem>2013/2014</asp:ListItem> ...