Is it possible to render a UnityAction field in a custom editor window?

I want to render a UnityAction in a custom editor window. Note that a UnityAction is what a UI Button uses to call methods of objects when the button is clicked.

I've been trying to mess around with 'SerializedProperty's but it appears that I can get fields of basic types (such as int) to show up, but I cannot seem to get 'SerializedProperty' of 'UnityAction'.

Does anyone know if this is possible, and how to achieve it?