movieclip lose reference

Hi all!
I've a problem :
I have a movieClip "myMc"
Inside this movieClip I create bitmapdata "myBmp"
from the "myMc" and i scale
it.
Then I want attach my bitmap to myMC like this :
myMC._parent.attachBitmap( myBmp, myMC.getDetpth() );
In fact, I want myBmp to crush myMc ...
It works fine ... but when I trace( Type.typeof( myMc ) )
=> TUnknown :(
The same with trace( myMc._width ) => undefined :(
The clip is isplayed but I loose reference ...
Any idea ?
Thanks,
Michel



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