def showPage(self, page):
        index = self.indexOf(page)
        if index == -1:
            index = self._hidden_pages.pop(page, -1)
            if index != -1:
                self.insertPage(index, page)
Show a hidden QPage instance in the notebook.
dataset/ETHPy150Open ContinuumIO/ashiba/enaml/enaml/qt/qt_notebook.py/QNotebook.showPage