code: function TbsStorePut($idx, $src, $onshow = null) {
  		if ($idx===$this->TbsCurrIdx) {
  			$this->TBS->Source = $src;
  		} else {
  			if (is_null($onshow)) {
  				if (isset($this->TbsStoreLst[$idx])) {
  					$onshow = $this->TbsStoreLst[$idx]['onshow'];
  				} else {
  					$onshow = false;
  				}
  			}
  			$this->TbsStoreLst[$idx] = array('src'=>$src, 'onshow'=>$onshow);
  		}
  	}
docs: Save a given source in the store.
  $onshow=true means [onshow] are merged before the output.
  If $onshow is null, then the 'onshow' option stays unchanged.