Problem: the "Download Codes (WiiRD Database)" button is enabled (and its click return silently without an effect) when "Tools → Cheats Manager" is opened during a running emulation for which there's no "[Gecko]" ini section, confusing the user about the reason for not downloading codes or showing an error

Solution: disable the button when it doesn't have an effect (to indicate to the user that this button must be clicked elsewhere, in the ISO settings dialog, the user will realise or remember)