ASHX file closes it's self whaen opening in new tab in IE7

YKMM used Ask the Experts™
I have an ASHX file which generates a PDF report and then forces download.
The ashx is opened through
my IE7 is configured to open new windows as new tabs.

when i click on the button,i see the tab opening, but closes its self immediatelly (half a second).
when surfing to the ASHX file and passing the data in the querystring, no problem.
in other browsers, and when opening in new window (not new tab) there's no problem.
any ideas?
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Thanks, but this wasnt it.
what i did, is instead of opening the new window with, i open it with navigateUrl (flex)
it seems like the + porce download of a file is a security problem for IE7
with navigateUrl it doesnt have a problem.
Thanks anyway :-)

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