code: @Api
  	public void showCard(KEY_TYPE key) {
  		Canvas newCurrent = cards.get(key);
  		if (null != newCurrent) {
  			if (newCurrent != currentCard && null != currentCard) {
  				currentCard.hide();
  			}
  			currentCard = newCurrent;
  			currentCard.show();
  		}
  	}
docs: Show the card associated with the specified key.
  
  @param key key associated to the card that should be shown
  @since 1.0.0