How I can create custom Style for Qt Quick Controls?

Hi everyone! I’ve still have a problem with custom style. For now I’ve used in my project this code: import QtQuick 2.3   QtObject {     property int rowHeight: 30     property int itemOffset: 22     property color backgroundNormalColor: "white"     property color backgroundPressedColor: "lightsteelblue"       property string titleLabelFontFamily: "Helvetica Neue"     property bool titleLabelFontBold: true     property bool titleLabelFontItalic: false     property bool titleLabelFontUnderline: false     property real titleLabelFontPointSize: 14     property color titleLabelNormalColor: "black"     property color titleLabelPressedColor: "white"       property string descriptionLabelFontFamily: "Helvetica Neue"     property bool descriptionLabelFontBold: false     property bool descriptionLabelFontItalic: false     property bool descriptionLabelFontUnderline: false     property real descriptionLabelFontPointSize: 11     property color descriptionLabelNormalColor: "black"     property color descriptionLabelPressedColor: "white"       property int iconPixelSize: 10     property url iconUrl: "../../images/expander.png" } As you can see from source I’ve removed all subobjects from root object. The question is: How I can use object not only “simple” type like: color, int, url, etc.? P.S. I’ve also tryen property with var type but when I try change property of subobject I’ve receive the error fro first post.