This may or may not be a feature already, but if it is not, I figured it would be a simple but very helpful feature addition.
I'm a very big fan of using regions in Visual Studio (ex. #region Button Events ....... #endregion) In Visual Studio this region a expandable and collapsable making it very nice and neat for code organization. Xamarin has the #region functionality but it is not collapsable or expandable. It would be great if this was implemented so that code organization and to minimize the amount of scrolling that is required.