code: public void makeVisible(final WComponent component) {
  		if (component.getParent() != getCardContainer()) {
  			throw new IllegalArgumentException(
  					"Attempted to make a component visible which is not contained in this WCardManager");
  		}
  
  		CardManagerModel model = getOrCreateComponentModel();
  		model.visibleComponent = component;
  	}
docs: Sets the visible component (card) for the given context.
  
  @param component the visible component.