Why does the click event of an image button that submitts a form does not
get fired when ENTER is pressend on a textbox of that form? How can I make
this happen?

Thanks

You can intercept the client side enter keypress event of the text box and
then do what you want using javascript code.

Here's a couple good articles on the subject:
http://www.allasp.net/enterkey.aspx
http://www.aspnetpro.com/features/2004/06/asp200406so_f/asp200406so_f.asp

You could also try using this free control.
http://www.metabuilders.com/tools/DefaultButtons.aspx

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