I need to focus on a textbox after an item has been selected from a dropdownlist.

I've tried control.focus() and setfocus().

The last thing I've tried was Set_Focus(dtbEffectiveDate.ClientID) inside the SelectedIndexChanged method with the folowing method.

Protected Sub Set_Focus(ByVal ControlName As String)
    Dim strScript As String

    strScript = "<script language=javascript> window.setTimeout(""" + ControlName + ".focus();"",0); </script>"
    RegisterStartupScript("focus", strScript)
End Sub

I'm out of answers so any help would be awesome.