OTClient OTClient button tooltip

[_M4G0_]

I'm trying to make the button change when the mouse hovers over it — that part works, but the tooltip doesn't show up. Does anyone have any tips?

function createShop()
  if shop then return end
  shop = g_ui.displayUI('shop')
  shop:hide()
  shopButton = modules.client_topmenu.addRightButton('shopButton', tr('Shop'), '/images/topbuttons/shop', toggle, false, 8)
  shopButton.onHoverChange = function(self, hovered)
        if hovered then
            self:setIcon('/images/topbuttons/shop')
            
        else
            self:setIcon('/images/topbuttons/shop1')
        end
    end

  connect(shop.categories, { onChildFocusChange = changeCategory })
end