scalatags optgroup label

[jvr...@googlemail.com]

How can I set the label attribute in an scalatags optgroup?

i.e.

select(...

optgroup(label := "labeltext",
                                    option(value := ... ) ...

-> Expression does not convert to assignment because receiver is not assignable

[jvr...@googlemail.com]

Meanwhile I wrote this little helper function which does the job:

 def ChangeLabel (id: String, s: String, groupnumber: Int) = {
  dom.document.getElementById(id).asInstanceOf[domhtml.Select].getElementsByTagName("optgroup")(groupnumber).asInstanceOf[domhtml.OptGroup].label = s
 }