1、引用nuget包 Wesky.Net.OpenTools OpenTools是一个用于提高开发效率的开源工具库。该项目为个人开源项目，采用MIT开源协议，永不更改协议。开源项目地址：
I\'m looking to use a dropdown menu (possibly an NSPopupButton object) to represent the hierarchical results of two Core Data entities (Genre and Movie) and their relationships. In my current data mod
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