Flex组件生命周期:validateNow、validateDisplayList、invalidateDisplalList、commitProperties等

I am extending VBox to make a Calendar component. What method should I override to add the code to draw itself? What is the difference between all these methods? Is there something I should be putting in each one, or is there a specific method I can just override, add my drawing code, and have it work?I am extending VBox to make a Calendar componen