are you using javascript code in your user control or custom control which may be interfering?also see
http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&oe=UTF-8&selm=u501cVuLBHA.388%40tkmsftngp03
http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&oe=UTF-8&selm=u501cVuLBHA.388%40tkmsftngp03
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