... Modal Dialogs . ... Dialogs are a continuous annoyance in plain GTK+; every time you want to tell the user anything, you have to create a window, create some buttons, create a label, pack the buttons and label into the window, set up callbacks, remember to capture "delete_event" , and so on. ... The "close" signal is designed to collect several possible user actions into a single handler: it should be emitted when the user presses Escape or the window manager's window close button is clicked. ...