Using NSIS, how to let user choose option on uninstall?

I'm using NSIS and the Modern User Interface 2. During uninstall, I want to let th开发者_如何学运维e user select whether to delete saved application data or not by clicking a checkbox... What is the best way to do this?

I guess you have two options:

• Put the optional code in a separate uninstall section and add a component page in the uninstaller
• Create a custom page with a checkbox and store the users choice in a variable and check this variable in your delete code