How to wire a programmatic control with events

Hi, I believe I won't truly understand the iphone sdk until I've tried things both through IB and programmatically. Below is some code that works for me in viewDidLoad to instantiate a control. How do I wire it with an event, programmatically?
(please feel free to refer me to a doc page, I haven't been able to find this...)
Thanks.
CGRect frame = CGRectMake(20.0, 68.0, 280.0, 31.0);
UITextField *aTextField = [[UITextField alloc] initWithFrame:frame];
aTextField.textAlignment = UITextAlignmentCenter;
aTextField.borderStyle = UITextBorderStyleRoundedRect;
aTextField.autocapitalizationType = UITextAutocapitalizationTypeWords;
aTextField.keyboardType = UIKeyboardTypeNamePhonePad;
aTextField.returnKeyType = UIReturnKeyDone;
[self.view addSubview:aTextField];

Are you referring to the view I'm subviewing the control to?
And I'm not using a delegate at the moment, nor am I sure about their role. The doc defines a delegate pretty generally, as a class performing work for another class.
I take that back, maybe I need more help than a help search keyword. Maybe a line or two of code...
I'm familiar with the supported events for my new programmatic UITextField, I'm just not sure how to trap any.

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