Thank you all for your answers. the User object is valid, because everything
i need when submitting the form is userID to save the data. that is why i'm
setting selected id to constructed object. why toString() returns "".
Because it was used to display formatted output of surname and name
somewhere in grid or beandisplay. it's not correct, i know, but it saved me
some time in past when i was testing tapestry functionality. 
i will not bother anyway with custom validator especially now, when i know
the reason. i just abandoned using toString as the source for meaningful
information. but i still wanted to know, if it is undesired behavior, to
check object.toString for empty. you confirmed this (although Howard's
opinion is decisive)
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