function MenuBar:AddButton(buttonData, pos)
    local button, key = self.m_pool:AcquireObject()
 
    button.m_object:SetData(self, buttonData)
 
    local onInitializeCallback = buttonData.onInitializeCallback
    if onInitializeCallback then
        onInitializeCallback(button)
    end
 
    local data = { button, key, buttonData.descriptor } -- update constants if order changes!
    if pos then
        table.insert(self.m_buttons, pos, data)
    else
        table.insert(self.m_buttons, data)
    end
 
    self:UpdateButtons()
 
    return button
end

function ZO_MenuBar_AddButton(self, buttonData, pos)
    return self.m_object:AddButton(buttonData, pos)
end