There are three Spells to CC Undead. Command Undead (T2), Halt Undead (T3) and Control Undead (T7). I have only slotted the T2 spell, which works heightened and enlarged pretty good on Wraiths, Vampires, Zombies, Skeletons and Umbral rats, worgs, gargoyles, etc. In general, all but the flying Undead are also cc-able by Web.
You should have enough feat slots for at least one whole Spell Focus line and the whole Spell Pen line.