As mentioned that does work. But I need to be able to handle it like this 
because it allows the script to extends objects which callbacks.

For example: say we have the internslly declared function template "Button". 
When a button I'd created the C++ program handles mouse clicks so it will know 
when the button is clicked. However it may be optional as to whether the script 
writer handles a click. So I use the field "Button.onclick" which when set 
overwrites an empty internal handler which the C++ code sees and when get'd 
returns the function.

It isn't obvious from the code posting (it is a very heavily simplified version 
of the original code) but the idea is that I don't need to keep getting the 
property "update" whenever an update is required because the callback is 
automatically set - thus making access to that callback a lot quicker when it's 
actually needed.

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