'Display a column that has been hidden using ``hide_column()``.
It is safe to call this on a column that is not hidden.'

def show_column(self, col_index):

    weight = self._column_weights[col_index]
    if self._labels:
        self._labels[col_index].grid(column=col_index, row=0, sticky='news', padx=0, pady=0)
    self._listboxes[col_index].grid(column=col_index, row=1, sticky='news', padx=0, pady=0)
    self.grid_columnconfigure(col_index, weight=weight)
