Accessing Telerik DropDownColumn from EditedTemplate

[byka]

I have a RadGrid (Telerik) with 2 columns. In first column I have radionButtonList. In editMode based on selected values I need to enable/disable telerik:GridDropDownColumn. Please help.

                                                <%# IIf(Convert.ToBoolean(Eval("IsHighLevel")) = True, "Yes", "No")%>

Protected Sub chkIsHighLevelIndexChanged(ByVal sender As Object, ByVal e As EventArgs)
Try

        Dim rblIsHighLevel As RadioButtonList = DirectCast(sender, RadioButtonList)
        If rblIsHighLevel.SelectedValue = "Yes" Then
            '
            ???? access dropdowncolumn to enable
                   End If