If you’ve been having trouble getting anything to appear when using the loadBitmap() function then chances are you’ve made a simple mistake. The documentation says to use the linkageId of a library object as the sole argument for this function i.e:
var myBitmap:BitmapData = BitmapData.loadMovie(“libObjectId”);
The key to using this function is that you have to attach an actual image object from the library; so say you’ve imported a jpg/png there, give this a linkageId and use that. Don’t drop an instance of the image into a movieclip/graphic object and give that an Id. That would be the reason it didn’t work. Be warned: you wont get an error message telling you it didn’t work, your bitmap will just be blank.