Insert a page into notebook at the given position, specifying the widget to use as the label in the popup menu.
the gtk.Widget to use as the contents of the page
the gtk.Widget to be used as the label for the page, or NULL to use the default label, “page N”
the widget to use as a label for the page-switch menu, if that is enabled. If NULL, and tab_label is a gtk.Label or NULL, then the menu label will be a newly created label with the same text as tab_label; if tab_label is not a gtk.Label, menu_label must be specified if the page-switch menu is to be used.
the index (starting at 0) at which to insert the page, or -1 to append the page after all other pages.
the index (starting from 0) of the inserted page in the notebook