getFlexReference(mPropertyBag) {
			return ManifestUtils.getFlexReferenceForControl(mPropertyBag.element);
		}
Returns the reference that is used for flexibility

@param {object} mPropertyBag - Object with parameters as properties
@param {sap.ui.base.ManagedObject} mPropertyBag.element - Element or component instance
@returns {string} Flex reference

@private
@ui5-restricted sap.ui.fl, sap.ui.rta