Adding a custom image button as an accessory view in MonoTouch
When adding a custom image view to a UITableRowCell in MonoTouch you must instantiate the object within the context of each row, not pass this in as a reference.
The image can be static and external to the row creation, but the holding class must be created within the GetCell or equivalent method call.
Check out this snippet on PasteBin to see a super short way of creating a custom image button on the AccessoryView.