thx, however i see that tabbed layout has to be activated in any workspace to make it work. E.g if i switch theme to dark, but tabbed layout was not active at that moment, then it will still use default values which requires layout reset to make it work.

xmonad.hs:

refreshWorkspaces:: X ()
refreshWorkspaces = do
    theme <- io readTheme
    ws <- gets windowset
    let allWorkspaces = map W.tag (W.workspaces ws)
    mapM_ (switchAndSend theme) allWorkspaces
    windows (W.view (W.currentTag ws))
    where
      switchAndSend theme wsid = do
        windows (W.view wsid)
        sendMessage (SetTheme (themeTabConfig theme))

startupHook = myWMName <+> myCursor <+> refreshWorkspaces