Hi
The Metro style app using JavaScript platform supports shortcut key functionality for setting focus or invoking elements, but you must implement shortcut keys in JavaScript by using keyboard event handlers.
<script>
var sendButton = document.getElementById('sendButton');
sendButton.addEventListener('keyup', function(e) {
var itm = e.srcElement;
if (e.ctrlKey && e.keyCode === 83 ) {
// Invoke send functionality.
}
});
</script>
Please refer to this link for more details.
http://msdn.microsoft.com/en-us/library/windows/apps/hh700327.aspx
Search: Keyboard shortcuts (optional) to get the scenario.
Hope it helpful.
Thanks.