can't find the control by id

ReferenceError: control is not defined

ListView.view.model.folder = fileUrl

import QtQuick
import QtQuick.Controls
import QtQuick.Layouts

import Qt.labs.folderlistmodel
import Qt.labs.qmlmodels
import QtQml.Models

ApplicationWindow {
	visible: true
	width: 800
	height: 480

	Button {
		text: "open"
		onClicked: control.open()
	}


	Dialog {
		id: control

		FolderListModel {
			id: folderModel
			showDirsFirst: true
		}

		contentItem: ListView {
			id: fileListView

			clip: true

			implicitWidth: 400
			implicitHeight: 300

			model: folderModel

			delegate: ItemDelegate {
				required property url fileUrl

				width: ListView.view.width
				text: fileUrl

				onClicked: {
					ListView.view.model.folder = fileUrl
					console.log("access control: " + control.width)
				}
			}
		}
	}


}