gtk:notebook-insert-page (notebook child tab position)

notebook -- a gtk:notebook widget
child -- a gtk:widget child to use as the content of the page
tab -- a gtk:widget object to use as the label for the page, or nil to use the default label, 'page N'
position -- an integer with the index starting at 0 at which to insert the page, or -1 to append the page after all other pages

An integer with the index starting from 0 of the inserted page in the notebook, or -1 if the function fails.

Insert a page into the notebook at the given position.