Hi Sam,
Two solution for this:
1. use the findcontorl method to find out the contorl,and then register the control as a trigger by calling theRegisterAsyncPostBackControl(Control) method, and then refreshe theUpdatePanel control programmatically by calling theUpdate() method.
2.hide a button out of the placeholders, and set it to be a trigger of the updatepanel, then you can access to the button by using "document.getElementById('Button1')" in content placeholdes.
You can also see these threads for more help.
http://forums.asp.net/t/1117770.aspx
http://forums.asp.net/t/1115934.aspx
http://forums.asp.net/t/1116851.aspx
Best Regards
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