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Event Handler UPP question

Hello,
I have a question about the way EventHandler UPP's work. In order to install an event handler, say to a window, you have to make a UPP for the handler function. Then you call InstallEventHandler to attach it to the window. Later, if you need to, you can remove the handler by using the Ref that is returned from the Install.

In my program, there is a point where I remove the handlers for a window, and I install different ones. This can happen several times during the program's running. My question:

Do the calls to NewEventHandlerUPP() reserve memory that I should be freeing? When should I free it? If the function that installs the handlers gets called many times, do I have a memory leak?

Thanks
Bob
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