What properties are available for use in XML layouts, and what format do I use for the value strings?
If you start at the documentation for the base Property class (Property base), you will get an inheritance diagram showing all properties in the system. When you click one, you’ll get its page. Each page has a description of the format in which you should provide its value. Besides, as an overview, each widget has its properties placed within an appropriately named C++ namespace within the namespaces section of the API reference. Also, remember that properties are inherited. So for example, when looking up properties for a PushButton, also check the properties for ButtonBase and Window too – since these properties are also available to you. The PropertyFinder tool generates a list of the properties for every widget. Lists of properties for the Taharez and Windows schemes are available online.