add

fun add(field: Field<*>, group: Group, idx: Int? = null, skipGroupValidation: Boolean = true): Boolean
fun add(fields: Collection<Field<*>>, group: Group, idx: Int? = null, skipGroupValidation: Boolean = true): Boolean
fun add(group: Group, idx: Int? = null): Boolean
fun add(groups: Collection<Group>, idx: Int? = null): Boolean