How to avoid automatic text scrolling vertically up as we enter the characters instantly inside the UITextView?(iPhone SDK 2.2.1))

Question

Hello,

Can you please tell me to which parameters the UITextView is dependent to avoid automatic text scrolling vertically up. I have put the UITextView on UIView by setting below parameters,

    mAddText.autoresizingMask = UIViewAutoresizingFlexibleHeight;
mAddText.directionalLockEnabled = YES;
mAddText.showsHorizontalScrollIndicator = NO;
mAddText.alwaysBounceVertical = NO;

Thank you.