Shortcut Key Question: Learner press Tab to submit question

I found this tutorial very helpful, http://community.articulate.com/tutorials/products/shortcut-key.aspx

but I missing a step on how to add the key command  for Tab. I need the learners to press Tab for the correct answer. If they press anything thing else (or if they click on the screen) I need the learners to have the incorrect feedback display. 

any help would be appreciated! 

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