Can't get F1 2013 to play in fullscreen.

Downloaded the game off of Steam and it opened up in windowed mode.  After going in and changing the resolution to match my monitor (1080p), and after hitting Alt + Enter, I still can't fill the whole screen.  I've made sure and double clicked the game window to make sure it fills the screen before hitting Alt + Enter and still haven't had any luck.  -fullscreen within the game properties in Steam also isn't working.

Anyone have any other suggestions?

(Win+R) or click Start > Run and copy/paste the command below & hit enter

wordpad "%userprofile%\Documents\My Games\FormulaOne2013\hardwaresettings\hardware_settings_config.xml"

On line 8 change fullscreen="false" to fullscreen="true" and save the file & re-run the game

Thanks TimD. I'll give this a shot when I get home today and let you know how it went.

Worked like a charm! Thanks Tim and the help is greatly appreciated.

@joseph_mach: There is a program somewhere that allows you to run all your games in borderless window mode.