just change the frames and radious which you want.. also add image in background if you want to display like a ballon with ballon image see code..
UIView *popUpView = [[UIView alloc] initWithFrame:view1.frame]; ///add the frame with requirement e.g view1,view2
popUpView.alpha = 0.0;
popUpView.layer.cornerRadius = 5;
popUpView.layer.borderWidth = 1.5f;
popUpView.layer.masksToBounds = YES;
[self.view addSubview:popUpView];
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.4];
[popUpView setAlpha:1.0];
[UIView commitAnimations];
[UIView setAnimationDuration:0.0];
UPDATE:
also see the custom popover view from bellow link..
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i hope this help you...