Event itemupdating which

This method takes the item that was modified, the property in the item that was updated, and its old and new values as parameters.Collections also provide the method to notify the collection of changes to a data provider object if the object does not implement the IEvent Dispatcher interface; in this case the object is not monitorable.If you specify the method is to notify a collection of changes to a custom class data source that you cannot make bindable or modify to implement the IEvent Dispatcher interface.The following schematic example shows how you could use the A collection’s disable Auto Update() method prevents events that represent changes to the underlying data from being broadcast by the view.Then the component wraps the Array in a collection wrapper.The wrapper must be manually notified of any changes made to the underlying Array data object, and you can use the metadata tag above a class definition, or above a variable declaration within the class, ensures that the class implements the IEvent Dispatcher interface, and causes the class to dispatch property Change events.

Adobe Flash and Flex Objects and other basic data types do not implement this interface.Therefore you must use the method if you must use an Array, rather than a collection, as an MX control’s data provider.It also prevents the collection from being updated as a result of these changes.Use this method to prevent the collection, and therefore the control that uses it as a data provider, from showing intermediate changes in a set of multiple changes.You use collection events to monitor changes to a collection to update the display.

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For example, if a custom control uses a collection as its data provider, and you want the control to be updated dynamically and to display the revised data each time the collection changes, the control can monitor the collection events and update accordingly.

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