So never mind, that it doesn't work. I made the helper method like this. I know, it is not ideal solution...
@helper EditorForCementType(CementType type)
{
@Html.RadioButtonFor(model => type, CementType.R, new { @id = "CementTypeR" })
<label for="CementTypeR">R</label>
@Html.RadioButtonFor(model => type, CementType.N, new { @id = "CementTypeN" })
<label for="CementTypeN">N</label>
@Html.RadioButtonFor(model => type, CementType.S, new { @id = "CementTypeS" })
<label for="CementTypeS">S</label>
}