How to maintain the data while popping a screen?

Hi all,
I am having a screen in which I am using the set data() method and populating the values.
After this I am pushing a new screen.
So when I come back to the original screen using popview(), I am not able to maintain the data on that screen as it is going in the set data method and giving the null object exception.
I want the original data to remain on the screen.
Is anyone having solution for this?
Thanks in advance.
Regards,
RONAK SHAH

This post might be useful: http://flexponential.com/2010/12/05/saving-scroll-position-between-views-in-a-mobile-flex- application/

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how to maintain the data into database table

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2. Loginto SE11 with the specified table and check the ATTRIBUTES tab. There you can set some parameters for maintaining the database. When you set Maintain database, you edit the data thorugh SE11 it self
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if I have a File, and the data in the file are type int, type String...
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How to maintain the data while popping a screen?

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