A decoration that includes small buttons on both ends which invoke various actions when clicked on: Show a window menu (see XMonad.Actions.WindowMenu), minimize, maximize or close the window.

Note: For maximizing and minimizing to actually work, you will need to integrate XMonad.Layout.Maximize and XMonad.Layout.Minimize into your setup. See the documentation of those modules for more information.

You can use this module with the following in your ~/.xmonad/xmonad.hs:

import XMonad.Layout.DecorationAddons
import XMonad.Layout.ButtonDecoration

Then edit your layoutHook by adding the ButtonDecoration to your layout:

myL = buttonDeco shrinkText defaultThemeWithButtons (layoutHook def)
main = xmonad def { layoutHook = myL }