Getting GameTooltip:GetItem()

[Benalish]

There's a way to get GameTooltip:GetItem() when GameTooltip is hidden? I know the GameTooltip tries to show when mouse hovers a game object, so I tried this script, but it doesn't seem to work

GameTooltip:HookScript('OnShow', function(self)
    print(self:GetItem())
end)