+ * @return @c EINA_TRUE on success, @c EINA_FALSE otherwise
+ *
+ * This sets the image file used in the background object. If the
+ * image comes from an Edje group, it will be stretched to completely
+ * fill the background object. If it comes from a traditional image file, it
+ * will by default be centered in this widget's are (thus retaining
+ * its aspect), what could lead to some parts being not visible. You
+ * may change the mode of exhibition for a real image file with
+ * elm_bg_option_set().