GroupBoxPage.qml Example File
gallery/pages/GroupBoxPage.qml 
          
            
            
import QtQuick 2.6
import QtQuick.Controls 2.1
ScrollablePage {
    id: page
    readonly property int itemWidth: Math.max(button.implicitWidth, Math.min(button.implicitWidth * 3, page.availableWidth / 3 * 2))
    Column {
        spacing: 40
        width: parent.width
        Label {
            width: parent.width
            wrapMode: Label.Wrap
            horizontalAlignment: Qt.AlignHCenter
            text: "A GroupBox provides a frame, a title on top of it, and a logical group of controls within that frame."
        }
        GroupBox {
            title: "Title"
            anchors.horizontalCenter: parent.horizontalCenter
            Column {
                spacing: 20
                width: page.itemWidth
                RadioButton {
                    text: "First"
                    checked: true
                    width: parent.width
                }
                RadioButton {
                    id: button
                    text: "Second"
                    width: parent.width
                }
                RadioButton {
                    text: "Third"
                    width: parent.width
                }
            }
        }
    }
}