Menu code

// Menu.cs : -FirstPass

public abstract class Menu<T> : MonoBehaviour where T:class, Menu<T>.Item {
// contents
    public interface Item {

// contents
    }
}

// RoundMenu.cs : -FirstPass

public abstract class RoundMenu : Menu<RoundMenu.Button> {
// contents
    public abstract class Button: DragButton, RoundMenu.Item {
// contents
    }
}

// UnitMenu.cs : -FirstPass

public interface UnitMenu<out T> where T: class, Menu<T>.Item {
// contents
}

// TargetedActionButton.cs : Second pass

public abstract class TargetedActionButton : RoundMenu.Button {
// contents
}

// FloatingMenu.cs : Second pass

public abstract class FloatingMenu : RoundMenu {
// contents
}

// FloatingUnitMenu.cs : Second pass

public class FloatingUnitMenu : FloatingMenu, UnitMenu<FloatingUnitMenu.Button> {

// redacted several methods and properties for brevity

    new public class Button : TargetedActionButton, Menu<FloatingUnitMenu.Button>.Item, UnitGroup.UnitButton {

// redacted for brevity

    }
}