fetch the ComboBoxEntry's Gtk.Entry svn path=/trunk/gtk-sharp/; revision=47750
svn path=/trunk/gtk-sharp/; revision=46842
* gtk/ComboBox.custom : add ctor (string[]). * gtk/ComboBoxEntry.custom : add ctor (string[]). * sample/test/TestComboBox.cs : simple new ComboBox tester. * sample/test/WidgetViewer.cs : button for simple new ComboBox tester. svn path=/trunk/gtk-sharp/; revision=46657