如何在弹出窗口中的文本字段中解除iPhone OS 3.2中的键盘？

Edit:Ok, this is weird... After doing extensive debugging, I have discovered that whilst the text fields are resigning first responder status (I can see that there is no longer a blinking bar in any), the keyboard is NOT GOING DOWN! Maybe this deserves a different question. Edit:Ok, this is weird... After doing extensive