Is it possible with Xfce 4.8 (Xubuntu 12.04) to have windows minimized on double-clicking the window frames? So, for example, if File Manager is open, to just double-click on the window frame and the the window "disappears" (is minimized to the panel). It would be great if there was a "simple" solution not having to install heavy additional packages.
XFCE has the ability to minimize the window when double-clicking the window title bar. I know this is not quite the same as double-clicking the frame, but its very simple without needing further packages or workarounds.
Use Settings --> Window Manager and change the double-click action for the title-bar as shown.