Iteration - how to find out if an object is a button?

Using "for (var i in _parent) {}" I'd like to find out all
button objects and call "i.disable()". However, I have the problem
to be unable to tell if any "i" is a button, because instanceof
does not work, and all other methods I tried, including simply
adding "if (i.enabled != undefined)" only resulted in compile
errors.
Help appreciated...

SOLVED - of course I have to use _parent
in the loop instead of just "i", which is only a
string.

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