The JXTitledPanel component is part of the SwingX (https://swingx.dev.java.net) project. It is a special Panel which comes along with a predefined border, a title and a content section.

SyntheticaAddons provides the TitledPanel-UI for every available Synthetica Look and Feel. The UI configuration is made via UI-defaults and is part of the 'synth.xml' file which belongs to every Synthetica Look and Feel. Synthetica Version 2.4 or above is required.