Is it possible to have multiple windows in a glade file, and display only one when the program starts, then show/hide the others as the need arises ? I can't find how... I have a main window with a menu. One entry shows the about dialog which is also defined in the glade file : aboutmenu <- xmlGetWidget xml castToMenuItem "apropos1" onActivateLeaf aboutmenu $ do widgetShowAll aboutdialog My problems are multiple : 1) how do I handle the close button that is automatically generated ? I tried doing this ... aboutdialog <- xmlGetWidget xml castToAboutDialog "aboutdialog1" onDestroy aboutdialog $ do widgetHide aboutdialog But the Close button doesn't work, and if I close the about dialog by the upper right cross button, it does disappear, but if I select again the menuitem, then a tiny empty dialog opens, as if the about dialog has been stripped out of all his inner components. And I get this line : (<interactive>:10852): Gtk-CRITICAL **: gtk_container_foreach: assertion `GTK_IS_CONTAINER (container)' failed I tried looking at the demos, but it doesn't help. The closest that could have helped uses an about dialog it creates, instead of reading from a glade file.