iPhone Dev：UIAlertView无法显示

I have a button linked up to an IBAction called sendWO. This should be insanely simple, perhaps I'm missing some fundamental concept of the UIAlertView class. It's hooked up in my viewcontoller, and if I put in some NSLogs I know the button is calling the sendWO class correctly, it just doesn't show the alert. No warnings/crashes or anything like that. I've tried using delegate:nil , sender, self too, and removing the argument completely.I have a button linked up to an IBAction called