You can set the ‘title’ of your NewLeaf document with an initial call to this function:

leaf.Titlebar 'Sample Page from NewLeaf'

This should be the first function you call after leaf.Init, as the title will be written into the page by leaf.Use. It will be shown by the in-built viewer and will may form the title of an output HTML page. It is also used to title the document in reports saved to PDF format, and will caption the window of any EPS files imported into MS Word as pictures.