how to show a window in same window not new page

[M4RZB4Ni]

hi,
i have 3 window and with below code second window show in a new page.
i want to when i pressed a button for open new page,new page dont show in new window and show in same window.
how i must do this?

Secretary *dialog = new Secretary;
    dialog->showMaximized();

thanks

[jsulm]

Then do not use QDialog.
You can use QTabWidget.

[mrjj]

Hi
QStackedwidget is also good for a design where you want a mainwindow
with "pages"