import QtQuick 2.0 import Qt.test 1.0 Item { id: first property bool aliasIsUndefined: false property alias sourceComponentAlias: loader.sourceComponent Component { id: redSquare Rectangle { color: "red"; width: 10; height: 10 } } Loader { id: loader sourceComponent: redSquare } function resetAliased() { loader.sourceComponent = undefined; aliasIsUndefined = (sourceComponentAlias == undefined); } }