show() {
        let effected = []
        for (let a = 0; a < arguments.length; a++) {
            let fld = this.get(arguments[a])
            if (fld && fld.hidden) {
                fld.hidden = false
                effected.push(fld.field)
            }
        }
        if (effected.length > 0) this.refresh.apply(this, effected)
        this.updateEmptyGroups()
        return effected
    }
If item.id is there, but item.text is not there, then look up item.text in options.items