Window Mangers :: No Tabs in Fluxbox 0.9.14

I "upgraded" to Fluxbox 0.9.14. My windows no longer have tabs and I don't see any options for them in the Fluxbox Config menu. Is this version supposed to have tabs? If so, how do I go about getting them back? Thanks in advance.
The tabs in the newer Fluxbox versions are embedded in the titlebar.  If you drag a window into another window, using the middle mouse button, you should get a split titlebar.

original here.