Currently there is no easy way to know if you use outdated Style Properties. Style Properties may be updated to have design changes, or even bug fixes, like in this case. Overview all customized Style Properties could be a big headache for a manual task. I've read that the Style Properties does not save the version, this should be changed and there should be a page that will report about outdated Style Properties. Please consider. This is mostly affect designers that creates themes for XF and have to update the themes when new version is released.