cxxwcreator — LibCXXW UI creator
cxxwcreator [themefile]
cxxwcreator loads an existing LibCXX Widget Toolkit UI theme file, or creates a new one, and provides an interactive way to modify the XML-based specification of LibCXXW's UI.
XInclude references in existing XML theme files are processed when loading the XML theme file. However that's logically equivalent to inserting the included contents in the XML document, and when cxxwcreator saves the updated theme file all included content appears, verbatim, in the theme file.