Little glitch when keyboard appears

Hello all :)

I'm doing an application that need a text entry. I need keep on the screen all which was typed (all that was typed is displayed in a List Object) in order to the user see the messages while he is typing another one.
The problem is: when the keyboard appears, the screen flashes. I think that this problem is because I marked the option "display keyboard over application windows", so the screen resizes when the keyboard appears. Unfortunately, I need to mark this option because if I don't do it, the keyboard stands in front of the newest messages in the List Object (the newest messages are in bottom of List Object).
Is there a way to solve my problem?

I apologize for my English, I'm brazilian.