This widget constructed in 100% pure VIM on Unix and hand crafted out of the finest electrons available on the market today. See your local CVS checkout for details.
Tabbed pane widgets can load data for their content either from the inline declaration, the data structure passed to the tab constructor, or a URL that provides a netWindows callback (2 lines to add, nothing at all really). There are still issues with the specified height of the box and inducing a scroll bar, but these should be fixed soon.
see source of this file for examples of both forms of content loading.
click on the little colored boxes at the top left to change the current theme
also of note, developers not need worry about how many URLs they use in a tabbed pane, as the URL loading mechanism is queued. A single URL is used in our example merely to demonstrate that the widget works.