def bring_tab_to_the_top(self, tab_label):
        """Find tab with label tab_label in list of notebook's and set it to the current page.

        :param tab_label: String containing the label of the tab to be focused
        """
        page = self.page_dict[tab_label]
        for notebook in self.notebook_names:
            page_num = self[notebook].page_num(page)
            if not page_num == -1:
                self[notebook].set_current_page(page_num)
                break