Why error messages not displaying in installed AIR app?

Hi!
Help me please understand how AIR handle errors. When I run air application from the Flex Builder and have some code that
generates an error, a window appears with the error description, such this:
TypeError: Error #1009: Cannot access a property or method of a null object reference.
at MyApp/genError()[C:\FlexProjects\MyApp\src\MyApp.mxml:10876]
at MyApp/___MyApp_Button92_click()[C:\FlexProjects\MyApp\src\MyAppmxml:10880]
So I can see where error is occur and handle it. But when I release build the same app, run it, click the button that generate error, nothing happens, no error messages etc. So users can not catch bug even if it happens and can't reported it ...

Thanks Ted!
I will make every effort to debug errors at development time, but can not be 100% sure that they can all be found immediately. Can I set in the compiler option some parameter to 'true' for displaying error messages or something like that?

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have a error message written in the WDDOBEFOREACTION method of my pop up window. But the message is not displayed on the window. But If the same is written in the event handler of the button click it is triggered.
strange..
wddobeforeaction will trigger then event handler wil trigger then wddoafteraction will trigger.
Did you put a break point in wddobeforeaction?
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