Hi Juliana,
You will notice that NoteSpace does scroll as you type. In that application the bug is that the appbar stays up. It should have been written so that the appbar disappears (it is doing some real strange things you will see as you play with it).
If you keep typing you will notice that the view will continue to scroll down and be in view.
Does your app have an appbar in it as well and is this what you are experiencing?
Have you taken a look at this sample:
http://code.msdn.microsoft.com/windowsapps/Keyboard-Events-Sample-866ba41c
This will help you understand how this all works together.
-Jeff
Jeff Sanders (MSFT)