QMLWidget05:
Added QQuickItem::itemchange(...) method call at the end of the re-implemented function.
reference URL:https://qt-project.org/doc/qt-5.1/qtquick/qquickitem.html#itemChange

deleted qmlwidget05_02. OpenGL Under QML sample should be referenced.
reference URL:http://qt-project.org/doc/qt-5.0/qtquick/scenegraph-openglunderqml.html