title: iOS8 - Custom Keyboard is not pushing previous chat up
body: <p>So I am developing a custom keyboard, and I notice that when I test my keyboard on Message app, when I click on the text input area, the keyboard just shows up and did not push the previous chat up which results in the keyboard blocking the latest chats.</p>
  
  <p>If I switch to system keyboard, the previous chats are being pushed up fine, and then I switch to my custom keyboard, sending some texts, all works fine.</p>
  
  <p>I am not sure if this is something that Custom Keyboards have to handle.</p>
  
  <p>Anyone encountered the same issue and maybe have a resolution for this?</p>
  
  <p>Thanks.</p>