# File locana/l_combobox.rb, line 366
   def on_enter_key(levent=nil, &block)
      return bind(:on_enter_key, block) if (block)  # this necessary to support Blocks the same as Proc objects

      if (@l_listbox && @l_listbox.is_visible?)
         on_after_update(:value=>self.value)
         on_close_listbox
      else
         super
      end
   end