Dynamically add SelectedIndexChanged to DropDownList

 Private Sub repSearchFilters_ItemDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.RepeaterItemEventArgs) Handles repSimpleWineSearchFilters.ItemDataBound
        Dim ddlFilter As DropDownList
        Dim lblSearchHeading As Label
 
        Dim taxon As CMDotNet.Common.Taxon.Taxon
        Dim repItem As Catalog.ShopTaxonomyFilters
        If e.Item.ItemType = ListItemType.Item Or ListItemType.AlternatingItem Then
            ddlFilter = e.Item.FindControl("ddlFilter")
            lblSearchHeading = e.Item.FindControl("lblSearchHeading")
            repItem = CType(e.Item.DataItem, Catalog.ShopTaxonomyFilters)
            taxon = CMDotNet.Common.Taxon.TaxonDAL.Instance.GetTaxon(repItem.TaxonomyID)
 
            If Not taxon Is Nothing Then
                If taxon.blnInUse Then
                    lblSearchHeading.Text = taxon.name & "..."
                    ddlFilter.Items.Add(New ListItem("please select", "none"))
                    AddHandler ddlFilter.SelectedIndexChanged, AddressOf FilterChild
                    PopulateChildTaxonomy(ddlFilter, repItem.TaxonomyID, "..")
                End If
            End If
 
        End If
    End Sub
 
    Private Sub PopulateChildTaxonomy(ByVal ddlFilter As DropDownList, ByVal parentTaxonID As Integer, Optional ByVal separator As String = "")
        Dim subTaxon As CMDotNet.Common.Taxon.Taxon
        Dim subTaxonColl As CMDotNet.Common.Taxon.TaxonCollection
 
        subTaxonColl = CMDotNet.Common.Taxon.TaxonDAL.Instance.GetOnParent(parentTaxonID)
        For Each subTaxon In subTaxonColl
 
            If subTaxon.blnInUse Then
                ddlFilter.Items.Add(New ListItem(separator + subTaxon.name, subTaxon.taxon_id))
                PopulateChildTaxonomy(ddlFilter, subTaxon.taxon_id, separator + "..")
            End If
        Next
    End Sub
 
    Private Sub FilterChild()
        MsgBox("EventHandler caught event.")
        txtWineSearchKeywords.Value = "Testy"
    End Sub

                                              

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<select id="ctl00_repSimpleWineSearchFilters_ctl00_ddlFilter" class="aePsItem" selectedindexchanged="FilterChild()" name="ctl00$repSimpleWineSearchFilters$ctl00$ddlFilter">
<option value="none">please select</option>
<option value="38">..Dessert</option>
<option value="39">..Fortifieds</option>
<option value="6">..Mixed</option>
<option value="4">..Red</option>
<option value="40">..Rose</option>
<option value="41">..Sparkling</option>
<option value="5">..White</option>
</select>

                                              

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