Save infromation in variable

Hello again,
I was wondering if someone has an idea how to capture the “progressbar_mc._xscale” on the fly, on a button press and store that info in a variable.
My head is about to blow and I just can’t get my head round the idea.

snd.onEnterFrame = function() {
this.loaded = this._sound.getBytesLoaded()/this._sound.getBytesTotal();
progressbar_mc._xscale = loadingbar_mc._xscale*this.position/this._sound.duration;
this.updateTime();
};

Any help would be greatly appreciated!
Thanks
M