qt - When using Editable ComboBox,I can NOT import QtQuick.Controls 2.2 -

in qml doc, there following:

import statement:

import qtquick.controls 2.2 

since: qt 5.7

"combobox can made editable." ...

i have latest qt opensource 5.9 installed. can not import qtquick.controls 2.2, simplest qt quick project created project wizard. following error print:

qrc:/main.qml:2 module "qtquick.controls" version 2.2 not installed

my code:

import qtquick 2.7 import qtquick.controls 2.2 import qtquick.layouts 1.3  applicationwindow { ... 

main.cpp

#include <qguiapplication> #include <qqmlapplicationengine>  int main(int argc, char *argv[]) {     qcoreapplication::setattribute(qt::aa_enablehighdpiscaling);     qguiapplication app(argc, argv);      qqmlapplicationengine engine;     engine.load(qurl(qlatin1string("qrc:/main.qml")));     if (engine.rootobjects().isempty())         return -1;      return app.exec(); } 

all codes generated qt creator 4.3

i work on windows 7.

if have qtquick 2.7 installed, need import qtquick.controls 2.0. import statement in documentation set newest version.
might happen, e.g. when new property introduced in newer version (see acceptableinput)

the combobox per se available since qt5.7 , corresponding qtquick.controls 2.0, properties have been added in qtquick.controls 2.2 comes qt5.9.