drilldown dropdownlist in formview. error: Eval(), XPath(), and Bind() can only be used in the context of a databound control

*note: for insert template follow same procedure except miss out the formview_databound code, for some reason it seems to run without it!
-see article: http://www.mikepope.com/blog/displayblog.aspx?permalink=1629
-set appenddatabounditems=true on all child ddls.
-add listitems in aspx of the ddl in formview like:
<asp:ListItem Selected="True"></asp:ListItem>
                <asp:ListItem  Text="(Select Province First)"></asp:ListItem>
-remove bind from selectedvalue property of the child ddls
-enableviewstate on ddl's = true
-keep autopostback=true
-alter PARENT ddl selectedindexchanged as:
Protected Sub DDL_Insert_Province_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs)
        REM Make sure AppendDataItems property in the child DDL is FALSE
        Dim dsc As SqlDataSource = FormView1.FindControl("SqlDataSource1_FV_District")
        Dim ddl_Province As DropDownList = FormView1.FindControl("FV_Edit_DDL_Province")
        Dim ddl_District As DropDownList = FormView1.FindControl("FV_Edit_DDL_District")
        dsc.SelectParameters(0).DefaultValue = ddl_Province.SelectedValue
        ddl_District.DataBind()
-alter formview databound as:
Protected Sub FormView1_DataBound(ByVal sender As Object, ByVal e As System.EventArgs) Handles FormView1.DataBound
      If FormView1.CurrentMode = FormViewMode.Edit Then
            Dim dv As System.Data.DataRowView = FormView1.DataItem
            Dim ddl_District As DropDownList = FormView1.FindControl("FV_Edit_DDL_District")
            Dim dsc As SqlDataSource = FormView1.FindControl("SqlDataSource1_FV_District")
            dsc.SelectParameters("Province").DefaultValue = dv("Province")
            ddl_District.DataBind()
            If Not IsDBNull(dv("District")) Then
                ddl_District.SelectedValue = dv("District")
            End If
        End If
-alter itemupdating of formview as:
Protected Sub FormView1_ItemUpdating(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.FormViewUpdateEventArgs) Handles FormView1.ItemUpdating
        Dim ddl_District As DropDownList = FormView1.FindControl("FV_Edit_DDL_District")
        e.NewValues("District") = ddl_District.SelectedValue
    End Sub