Each Theme subsection includes several properties whose values are referenced by one or more Style properties. The property values in Theme subsections are set when you choose a Theme. You may modify the properties if desired.
The Theme.Theme Properties section is empty for most Themes. For some Themes, it contains Theme-specific properties. Theme-specific properties are provided when the Theme designer wants to provide a means to change a style attribute that is not a standard property in one of the other Theme subsections. For example, the Simple Blue Theme includes a property to choose the header text color.
See the Styles Section help page for more details.