[Garual]

Originally Posted by Quokka than something like this should work If i understood Seerah right

Yep your right. For every panel set OnLoad:

self:RegisterEvent('UNIT_ENTERED_VEHICLE')
self:RegisterEvent('UNIT_EXITED_VEHICLE')

and in OnEvent:

if event == "UNIT_ENTERED_VEHICLE" then
 self:Hide()
else
 self:Show()
end