Unable to set custom class for label of RadioList item

[peterpp]

Use case: custom renderer with method:

public function renderControl(Nette\Forms\IControl $control)
{
    ...
    if ($control instanceof \Nette\Forms\Controls\RadioList) {
         $control->getLabelPrototype()->class("my-class", TRUE);
    }
}

This custom class is not propagated to final <label> tag. The problem is in method RadioList::getControl() on line 92. Here we can find only this array for label attributes:

array('for:' => $ids)

On the other hand, CheckboxList works fine.