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Focus Problem

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I have a focus problem..

I have some tabs and when I click on submit from nth tab,a validation will be thrown [as per reqt because of required field missing] and the tab which has missing details would be shown...

the scenario where problem occurs is like this ...

when I click on submit exception is thrown for first time and moved to corresponding tab..If I come back to previous tab from where I submitted all fields are accesible...If I submit again without giving mandatory data the exception is thrown again...as said previous If I go back to the same tab from where i submitted, the field[x] in which I entered some data previously gets disabled with cursor in it.
If I select some other field [field y in this tab] I could still do it but with a cursor in it[field y] as well..i.e two cursors in same tab.....

This is a peculiar focus problem...it happens only after second time the exception is thrown...and happens with all text field ..

I tried to gain focus with focus releated methods....grabfocus() ..Requestfocus()...but no response...

Pl provide your valuable suggestions to solve this issue...
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