StoreStateChangeEvent

```
public interface StoreStateChangeEvent
```
In order to handle local event, we need to compare the parent of event's source and GUIAction'parent. But if an event happened before the source added to a container, this will cause the parent of event' source is null. So we need this mechanism to store the event, then broadcast later.

All Methods Instance Methods Abstract Methods
Modifier and Type	Method and Description
`void`	`broadcastStoredStateChangeEvent()` Broadcast the stored StateChangeEvent
`java.util.Vector`	`getStoredStateChangeEvent()` Get the stored state change event.
`void`	`storingStateChangeEvent(StateChangeEvent event)` This method is called if a StateChangeEvent need to be stored

Interface StoreStateChangeEvent