ocesses keys associated with a checkbox 
 *
 * @param ( event ) event is the event handler for the event
 * @param ( Checkbox object ) checkbox is the Checkbox object that is the target of the keyboard event
 *
 * @return false to stop event propagation if mouse event was used by checkbox, else true
 */

handleCheckboxKeyDownEvent = function(event, checkbox) {
	// If IE get the IE event object
	var e = event || window.event;

  switch( browser.keyCode(e) ) {

    case KEY_SPACE:
	     // When space hit togg