Help With 4 CP's in One Round A/D Map

I'm trying to make a one round Attack/Defend Control Point map with 4 Control Points. Every time I test it the first two points work fine; the second point does unlock after I capture the first point, but when I try to unlock the third point by capturing the second point it won't unlock. I'm wondering if it's possible to have more than two points per a round in an attack/defend map? Or am I just doing something wrong?

Okay got it, I didn't have the trigger connected to the control point. It works now.