hi there.. I think you have the wrong control...
for selecting only one item of many you use a radiobutton, witch can be selected only one and can't be unselected unless you choose another radiobutton...
if you want to allow the user to check many item and have the posibility to un-check them use a checkbox.
HTH
Gonzalo
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Read this if you want to know how to get a correct reply for your question:
http://www.catb.org/~esr/faqs/smart-questions.html
^^Took that from dparsons signature and he Took that from planoie's profile
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My programs achieved a new certification (can you say the same?):
WORKS ON MY MACHINE
http://www.codinghorror.com/blog/archives/000818.html
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I know that CVS was evil, and now i got the proof:
http://worsethanfailure.com/Articles...-Hate-You.aspx
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