UItextfield password

I know that its possible to make UITextfield operate in a password mode by using the following :

textfield.secureTextEntry = YES;

This changes all characters entered by the user into '*'. However, the last character entered flashes up for about half a second. I understand that this is standard behavior.

Is there any way of stopping this and keeping the characters entered completely obscured?

To achieve this, Im thinking of subclassing UITextField and then overriding drawTextInRect:rect

But I would welcome any other suggestions.