diff -up dialog-1.3-20160424/formbox.c.orig dialog-1.3-20160424/formbox.c
--- dialog-1.3-20160424/formbox.c.orig	2013-09-02 19:02:05.000000000 +0200
+++ dialog-1.3-20160424/formbox.c	2016-08-23 11:25:56.273045091 +0200
@@ -447,9 +447,11 @@ prev_valid_buttonindex(int state, int ex
 	DLG_KEYS_DATA( DLGK_FIELD_PREV, KEY_BTAB ), \
 	DLG_KEYS_DATA( DLGK_ITEM_NEXT,  CHR_NEXT ), \
 	DLG_KEYS_DATA( DLGK_ITEM_NEXT,  KEY_DOWN ), \
+	DLG_KEYS_DATA( DLGK_ITEM_NEXT,  KEY_RIGHT ), \
 	DLG_KEYS_DATA( DLGK_ITEM_NEXT,  KEY_NEXT ), \
 	DLG_KEYS_DATA( DLGK_ITEM_PREV,  CHR_PREVIOUS ), \
 	DLG_KEYS_DATA( DLGK_ITEM_PREV,  KEY_PREVIOUS ), \
+	DLG_KEYS_DATA( DLGK_ITEM_PREV,  KEY_LEFT ), \
 	DLG_KEYS_DATA( DLGK_ITEM_PREV,  KEY_UP ), \
 	DLG_KEYS_DATA( DLGK_PAGE_NEXT,  KEY_NPAGE ), \
 	DLG_KEYS_DATA( DLGK_PAGE_PREV,  KEY_PPAGE )