qtquickcontrols2 - Why is QML ScrollView not available in QtQuick.Controls 2.0? -

i have following qml, , trying add scrollview around listview:

import qtquick 2.7 import qtquick.controls 2.0 // works if 1.4 specified import qtquick.layouts 1.0  item {     width: 600     height: 400     property alias textoutput_listview: textoutput_listview     property alias dooffsetgaincal_button: dooffsetgaincal_button      button {         id: dooffsetgaincal_button         x: 40         y: 38         text: "do offset/gain cal"     }      scrollview {         listview {             id: textoutput_listview             x: 40             y: 99             width: 300             height: 256              model: textoutputlistmodel             delegate:  rectangle {                 x: 0                 y: 0                 width: 100                 height:18                 text { text: modeldata }             }              rectangle {                 id: rectangle2                 color: "#ffffffff"                 visible: true                 z: 1                 anchors.fill: parent                 border.color: "#7d7d7d"                 opacity: 0.2             }         }     } } 

however, if import qtquick.controls 2.0, scrollview reported 'not type'. if import 1.4 works.

googling has not indicated scrollview has been deprecated or replaced.

am wrong in expectation versions of qml components replace older ones - meaning supposed import 2.0 , 1.4?

scrollview has been introduced in qt quick controls 2.2 in qt 5.9. provides flicking , non-interactive scroll indicators on touch, , switches interactive scroll bars , disables flicking when interacted mouse pointer.