John Doe 25 This is the John Doe row Mary Unknown 50 This is the Mary Unknown row Builder demo gtk3-demo 250 440 Builder 1 1 The menubar 1 _File 1 1 _New 1 1 _Open 1 1 _Save 1 1 Save _As 1 1 1 _Quit 1 win.quit 1 _Edit 1 1 _Copy 1 1 _Cut 1 1 _Paste 1 1 _Help 1 1 _Help 1 win.help 1 _About 1 win.about 0 1 The toolbar 1 New Create a new file document-new 1 Open Open a file document-open 1 Save Save a file document-save 1 1 1 Copy Copy selected object into the clipboard edit-copy 1 Cut Cut selected object into the clipboard edit-cut 1 Paste Paste object from the clipboard edit-paste 0 1 in 1 1 liststore1 3 Name list A list of person with name, surname and age columns Name 0 Surname 1 Age 2 2 1 1 3 0