def on_btn_new_tab_clicked(self, widget):
page = ScannerPage(self.storage)
label = ScannerPageLabel("[new scanner]", self.mainNotebook)
id = self.mainNotebook.append_page(page.get_widget(), label.get_widget())
label.set_page_id(id)
page.set_page_id(id)
page.set_label(label)
