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Create a modulator (button or uiImageButton)

--
-- Called when a modulator value changes
-- @mod http://ctrlr.org/api/class_ctrlr_modulator.html
-- @value new numeric value of the modulator
--
myMethod = function(--[[ CtrlrModulator --]] mod, --[[ number --]] value, --[[ number --]] source)
if value == 1 then
panel:getPanelEditor():setProperty("uiPanelMenuBarVisible", 1, false)
else
panel:getPanelEditor():setProperty("uiPanelMenuBarVisible", 0, false)
end
end

Source: https://ctrlr.org/forums/topic/hidingshowing-menu-bar/