This question was posted in response to the following article: http://help.adobe.com/en_US/flex/mobileapps/WSf3db6597adcd110e19124fcb12ab3a1c319-8000.htm l
I see my mobile App in FB 4.6 does not like Alert.
ERROR import mx.controls.Alert;
What can I use for an Alert control?
The mobile alternative for the mx.controls.Alert class is to display the alert using the Spark SkinnablePopUpContainer class.
Here's an article by Holly Schinsky that focuses on creating pop-up alerts in a Flex mobile application: http://www.adobe.com/devnet/flex/articles/flex-mobile-development-tips-tricks-pt4.html
Hope this helps,
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