Loaded SWF file CANNOT be made into button DIRECTLY?

Question

I'm experiencing a problem which may have no solution, but I
would like to know why I cannot do what I want to do.
PROBLEM:
I am attempting to load in an external SWF file and once it
is loaded, I wish to directly make the new Sprite/MovieClip into a
button. However, the newly loaded Sprite/MovieClip seems to be
resistant to be made into a button DIRECTLY. I would like to know
why this is.
WORKAROUNDS:
Here are a couple of workarounds, but again I wish to know
why I cannot do what I want to do.
1) I place the new Sprite/MovieClip into an empty Sprite on
stage and make the once empty sprite into a button.
2) Construct the external SWF in such a way so i can refer to
a MovieClip within the SWF file and make that MovieClip into a
button.
CODE EXAMPLE:
I am loading a SWF file thru a Loader and then taking the
loaded SWF file and adding it to an existing sprite on the stage. I
then attempt to make a button out of the newly loaded swf file, but
it fails to be clickable.
The following is some quick code to illustrate my problem. I
already have workarounds in place, so please let me know WHY the
following code is impossible. thanks!
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Answer 1

There should be no problem with what you are trying to do. If
you want someone to look at what you've done, you have to be
careful to show that and not possibly errant code because that is
the substance of your post and what you requested be looked at--we
cannot guess what you may have done wrong in setting things up or
for code that you do not show.
I tried your code before posting my response and it worked
fine except for your error with the COMPLETE aspect. I did not
utilize any objects for loading things into, so I suggest you look
there.