How I can stop the select_row signal in clist

Dear All.

I need to stop select_row (unselect_row) signal in clist. At some cases
I'll would like to restrict to change selection in the clist. 
In my signal handler for the select_row signal I use function 
$clist->signal_emit_stop_by_name('select_row'), but it's does not
work, row are selected. 
I was also tested this method with the demo program from the
gtkperl-tutorial called clist, see the attachement, but it was failed too.

How I can solve this problem? Any suggestion will be fine. 

Thanks, anyway.

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