selectOptGroup

fun Select.selectOptGroup(    label: String,     options: List<<Error class: unknown class>>? = null,     maxOptions: Int? = null,     disabled: Boolean = false,     className: String? = null,     init: SelectOptGroup.() -> Unit? = null): SelectOptGroup
fun SelectInput.selectOptGroup(    label: String,     options: List<<Error class: unknown class>>? = null,     maxOptions: Int? = null,     disabled: Boolean = false,     className: String? = null,     init: SelectOptGroup.() -> Unit? = null): SelectOptGroup

DSL builder extension function.

It takes the same parameters as the constructor of the built component.