function forEachChildElement(fn, sComponentId) {
		ElementRegistry.forEach(function(oElement, sId) {
			var sElementOwnerId = Component.getOwnerIdFor(oElement);
			if (sElementOwnerId === sComponentId && !oElement.getParent()) {
				fn(oElement, sId);
			}
		});
	}
Executes the given callback function for each sap.ui.core.Element whose owner-component
has the given ID and which has no parent.
@param {function(sap.ui.core.Element, sap.ui.core.ID)} fn callback function
@param {sap.ui.core.ID} sComponentId the component ID used for the owner check