gtk/gtk.go
func (v *Assistant) AppendPage(page IWidget) int {
	c := C.gtk_assistant_append_page(v.native(), page.toWidget())
	return int(c)
}
func (v *Assistant) AppendPage(page IWidget) int {
	c := C.gtk_assistant_append_page(v.native(), page.toWidget())
	return int(c)
}
// AppendPage is a wrapper around gtk_assistant_append_page().