gtk:notebook-prepend-page (notebook child tab)

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'

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

Prepends a page to the notebook.