hide/unhide active window via Window Buttons

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Thanx for you reply, misko_2083!

Yes, Window Menu & Alt-TAB behave as I expect, but a bit used to App Buttons so I dig into the source code.

Seems there is a little trick:
xfce4-panel-4.11.0/plugins/tasklist/tasklist-widget.c

Code:

static void
xfce_tasklist_button_activate (XfceTasklistChild *child,
                               guint32            timestamp)
{

...

  if (wnck_window_is_active (child->window)
      || wnck_window_transient_is_most_recently_activated (child->window))
    {
      /* minimize does not work when this is assigned to the
       * middle mouse button */
      if (child->tasklist->middle_click != XFCE_TASKLIST_MIDDLE_CLICK_MINIMIZE_WINDOW)
        wnck_window_minimize (child->window);
    }
  else

I've simple set my middle button to "MINIMIZE" mode and it works!