[Taudier]

you can 'WrapScript' the 'OnShow' & 'OnHide' vehicule ui. more reliable than [vehicleui].

for i=1, 6 do
	local button = _G["OverrideActionBarButton"..i]
	handler:WrapScript(button, "OnShow", your function)
	handler:WrapScript(button, "OnHide", your function)
end

or just the first button