_visible vs. _alpha create emptyMC

Okay this makes absolutely no sense to me.

On my main timeline I have created an empty MC, then I load an external swf into it:
[AS]
this.createEmptyMovieClip(“textBox”, 5);
textBox.loadMovie(“textbox.swf”);
[/AS]

For some reason this doesn’t work:
[AS]
this.textBox._visible = false; // or ‘0’ for that matter
[/AS]

but THIS does! :hair:
[AS]
this.textBox._alpha = 0;
[/AS]

Can someone explain why this is so? :h:

Thanks! :bu: