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