LXDE use WinKey to open AND close main menu (LXPANEL)

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http://unix.stackexchange.com – I was able to set Winkey to open the menu. But I expect that pressing it again would close the menu which is not happening. This issue is almost the same as this: GNOME: Use WinKey (Super_L) as a main menu toggle except this is for LXDE and not GNOME. (HowTos)