None)         :
     - insert(self, col_text, item, before, col_text_align = None)
     - delete(self, item)
     - replace(self, col_text, item, col_text_align = None)
     - current(self) : returns current item
     - setCurrent(self, item): sets an item as current
     - clear(self): clear the listbox
     
     Alignments may be LEFT, RIGHT, CENTER, None
    r