How to move the buttons in a UIAlertView to make room for an inserted UITextField

UIAlertView* find = [[UIAlertView alloc] init];
[find setDelegate:self];
[find setTitle:@"Find"];

[find addButtonWithTitle:@"Cancel"];
[find addButtonWithTitle:@"Find & Bring"];
[find addButtonWithTitle:@"Find & Go"];
[find addButtonWithTitle:@"Go To Next"];

[find addSubview:_findText];

CGRect frm = find.frame;
int height = frm.size.height + _findText.frame.size.height + 100; // note how even 100 has no effect.
[find setFrame:CGRectMake(frm.origin.x, frm.origin.y, frm.size.width, height)];

[find setNeedsLayout];
[find show];
[find release];

[find setMessage:@"n"];

// Create Alert
UIAlertView* av = [UIAlertView new];
av.title = @"Find";
// Add Buttons
[av addButtonWithTitle:@"Cancel"];
[av addButtonWithTitle:@"Find & Bring"];
[av addButtonWithTitle:@"Find & Go"];
[av addButtonWithTitle:@"Go to Next"];
// Make Space for Text View
av.message = @"n";
// Have Alert View create its view heirarchy, set its frame and begin bounce animation
[av show];
// Adjust the frame
CGRect frame = av.frame;
frame.origin.y -= 100.0f;
av.frame = frame;
// Add Text Field
UITextField* text = [[UITextField alloc] initWithFrame:CGRectMake(20.0, 45.0, 245.0, 25.0)];
text.borderStyle = UITextBorderStyleRoundedRect;
[av addSubview:text];
[text becomeFirstResponder];

UIAlertView *insertScore = [UIAlertView new];
	[insertScore setDelegate:self];
	[insertScore setTitle:@"New Title!"];
	[insertScore addButtonWithTitle:@"Cancel"];
	[insertScore addButtonWithTitle:@"Ok"];

	insertScore.message = @"n";

	[insertScore addTextFieldWithValue:@"Input" label:@"player"];

	[[insertScore textField] setDelegate:self];

	[insertScore show];

	[insertScore release];

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
  NSLog(@"%@",[[alertView textField] text]);
}

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"UIAlertView"
    message:@"<Alert message>" delegate:self cancelButtonTitle:@"OK"
    otherButtonTitles:nil];
[alert addTextFieldWithValue:@"" label:@"Text Field"];

[alert setNumberOfRows:3];

@interface UIAlertView ()
- (void) addTextFieldWithValue: (NSString*) val label: (NSString*) label;
- (UITextField*) textField;
@end

// extend the UIAlertView class to remove the warning caused
// by calling setNumberOfRows.
@interface UIAlertView (extended)
- (void) setNumberOfRows:(int)num;
@end

[myAlert setNumberOfRows:2];