[semlar]

You might even try something like this to switch it back if it modifies the value..

hooksecurefunc(getmetatable(ActionButton1).__index, 'SetAttribute', function(self, attribute)
    if attribute ~= 'showgrid' then return end
    self:SetAttribute('showgrid',0)
    if not HasAction(self.action) then
        self:Hide()
    end
end)

So if SetAttribute gets called on the action button it just resets it back to 0.