Xamarin allow me to create UI controls with behavior which I need. In this repository you will find deferent controls and how you can interact with them. Here is a little list of controlls which I intereact: NSButton, NSTextField, NSTextView, NSplitView, NSTableView, NSNotificationCenter and other UI controls.
In Util folder you will find little useful examples of code like fingerprint service, native loger, how was with clipboard and other.