Capture exit event

Hi All,
How can I capture the exit event from a canvas component?
I try exitState but it's not working:
<mx:Canvas xmlns:mx="http://www.adobe.com/2006/mxml" width="100%" height="100%"
backgroundColor="white" creationPolicy="all" exitState="checkExit()">
private function checkExit():void{
Alert.show("exit");
I try the same removed but it doesn't start the form, it shows the Alert right away.
removedFromState it doesn't work either.
Any ideas?
Thanks
Johnny

Thanks for your reply and help.
I have a menu with many options, each option will open a canvas component thru a viewStack.
When I call the component I item with viewStack.selectedItem = mycomponenIDNumber and fire the init() funciton, now when I click something else in the menu if I'm in a component I want to check something before I leave the component and fire a condition like:
Alert.show("Do you want to Save the updates?","ALERT", Alert.YES|Alert.NO, this, alertClickHandler);
Remove, removed and removeFromState doesn't fire.
Rgds
Johnny

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Edited by: user8898100 on 2011-8-2 上午7:49

Mandy,
Its really strange that its not able to caputure the event in CO.
Below is the way in which we handle to Submit action at CO level.
/Check whether ClearBtn is same in case too.
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Hi Guys,
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--Mukul

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PERFECT!!! Works right out of the box!
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Message was edited by: Srikanth Pinnamaneni

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http://www.oracle.com/technetwork/developer-tools/adf/learnmore/97-deferred-trainstop-navigation-1528557.pdf

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import java.awt.*;
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}(Too bad blank lines are stripped, eh?)
Thanks in advance for any insights you may be able to provide.
---Mark

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Operating System
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Gigabyte Technology Co., Ltd. M61PME-S2P
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256 kilobyte primary memory cache
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The media files are avi and are in my videos folder (videos-windows 7)

Capture exit event

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