Closing Controls

Should I manually close controls and set variables to Nil before Closing a Window or does this happen automatically when I invoke Window.Close?

they should be closed as well

http://www.realsoftwareblog.com/2011/01/managing-your-memory.html

Meaning they should be closed automatically for you. Just to clarify.

The reason I ask is because it seems that when a Window is closed the memory my app is using doesn’t go down. Shouldn’t it go down?