Huge Problem with attachbitmap inside a mc

Hi I am having a big problem with attachbitmap.

I have a movieclip “thisLoader” and inside is another mc “innerMc” I am attaching a bitmap to “innerMc” using attachbitmap.

The problem is after the bitmap is loaded I cannot get the correct width for “thisLoader” or “innerMc” they both coming back as 0??? Also I cannot set the width for either mc

I know that the bitmap is in the mc because I can set the alpha to 0 and the image dissapears. Please can anyone help me this is killing me.