Problem when refreshing Parent Window

Hi,
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I have a page which has some custom controls. The page works fine and
doesn't break on any number of refreshes.
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There is button on the page, that starts a new child window. After doing any
thing or nothing, when the user clicks the 'close' button I want to refresh
the parent window. It works a few times than the parent window goes into a
'kind of indefinite looop'
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I'm clueless as whats going on.
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Any help!!!