How to physically delete my attachments in "Manage Attachments"?

[vicelover]

Hi,

If users want to delete their attachment in "Manage Attachments" by themselves, how to? See the below picture, how to delete them if I want to.
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https://vborg.vbsupport.ru/external/2010/03/30.jpg (http://www.vbulletin.com/forum/attachment.php?attachmentid=43887&d=1268908765)
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I tried to delete them from UCP, (see below pic ) but I failed. It seems that, deleting attachments from UCP is only delete the files in the relative thread or post.
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https://vborg.vbsupport.ru/external/2010/03/31.jpg (http://www.vbulletin.com/forum/attachment.php?attachmentid=43888&d=1268909063)

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Thanks in advanced.