How to set WP8 virtual keyboard style

Hello, I'm having trouble with finding a way to set the windows phone native on-screen virtual keyboard's style. More concretely, I want to have the native text field that usually appears right above the keyboard( so that you can move the input cursor, select text, copy, paste etc.). I'm using TouchScreenKeyboard.Open. From what I understand TouchScreenKeyboard.hideInput should do that, but setting it has no effect. If it's not possible to do from Unity, maybe I can patch the project that Unity generates ( Windows Universal 8.1 )? Also, it would be nice if I can set the keyboard text field's text when I open the keyboard, as well as selecting it. Thanks a lot.