Scroller for photo gallery

hi guys, i need a little bit of help, thanks in advance, the problem is that i am trying to do a photo gallery, and i have been doing the tutorial of photo gallery, the problem is that the scroller for the thumbnails doesn´t work, i mean it doesn´t appear, there´s nothing on the screen, i don´t know what the problem is, the pictures above appear correctly but the problem is the scroller, i have tried a lot of thing but i can´t get it to work, maybe the problem is that i used flash cs3, and the tutorial was made for flash mx 2004, guys can you point me in the right direction?,

thank you