Accessing Spells as Sorcerer ?

I have a 4th level Dragon Discipline that has 4 Magic Missile, 4 Chrom Orb and 4 Sleep spells stuck at the only spells available. How do I access the spell book to see other spells. I click on the mage book (left side of screen), but no other spells are shown.
0
Comments
Sorcerers don't get to know many spells.
http://baldursgate.wikia.com/wiki/Sorcerer
(For the classic IWD, you can use Dale Keeper instead.)