Workspace Whiz. is an add-in by Joshua C. Jensen that can, amongst many other things, perform a source/header flip. Since Workspace Whiz. has a more comprehensive flip command (it can actually scan your project for valid files/paths). With this option enabled, WndTabs can attempt to use Workspace Whiz! in place of its own flipping functionality.
The option has no effect if Workspace Whiz! isn't installed.
Note: For older versions of Workspace Whiz! (Workspace Utils), WndTabs attempts to flip using the WUHeaderFlip command. The use of WUHeaderFlip is limited to the active window only. It may also have some side affects.
Also see: "Integration With the
Workspace Whiz! Add-In" for further detail.