Good point, thank you. Some things look in that weird way only because my (unfinished) implementation. You could use the exact same control as you would use in vanilla Cocoa app, you just need to write a correct wrapper (ViewManager). Most of the current controls are ported from iOS, I certainly should improve some of them. Also, UIExplorer also a ported app, and being not a great example, should be rewritten to achieve more OSX look and feel.

Update. Filled the issue https://github.com/ptmt/react-native-desktop/issues/52