Crash opening ui file

[Gaurav Juvekar]

Opened glade-gtk2

Dragged this file into it
http://bazaar.launchpad.net/~ubuntu-installer/ubiquity/trunk/view/head:/gui/gtk/stepUserInfo.ui

````
$ glade-gtk2
(glade-gtk2:28488): GLib-GObject-WARNING **: Attempt to add property GnomeProgram::sm-connect after class was initialised

(glade-gtk2:28488): GLib-GObject-WARNING **: Attempt to add property GnomeProgram::show-crash-dialog after class was initialised

(glade-gtk2:28488): GLib-GObject-WARNING **: Attempt to add property GnomeProgram::display after class was initialised

(glade-gtk2:28488): GLib-GObject-WARNING **: Attempt to add property GnomeProgram::default-icon after class was initialised
GladeUI-Message: No displayable values for property GtkToolPalette::icon-size
GladeUI-Message: No displayable values for property GtkToolItemGroup::ellipsize
GladeUI-Message: No displayable values for property GtkToolItemGroup::header-relief
GladeUI-Message: No DevHelp installed on your system, devhelp feature will be disabled.

(glade-3:28488): GLib-GObject-ERROR **: cannot create instance of abstract (non-instantiatable) type 'GtkBox'
Trace/breakpoint trap
````

$ glade-gtk2 --version
glade3 3.8.0