diff -urN cui17/cui.c cui18/cui.c
--- cui17/cui.c	Thu Jan 30 22:00:00 2014
+++ cui18/cui.c	Thu Jan 30 22:20:00 2014
@@ -183,11 +183,39 @@
 	int val;
 	
 	if(obj == NULL) return;
+	if(!cui_is_visible(obj)) return;
 	val = (obj == cui_focus) ? CUI_DRAW_FOCUS : CUI_DRAW_NORMAL;
 	cui_handler_call(obj, obj->handler_list, CUI_EVT_DRAW, val);
+	cui_draw_chain(obj->children);
+}
 
-	cui_draw(obj->next);
-	cui_draw(obj->children);
+void
+cui_draw_chain(cui obj)
+{
+	if(obj == NULL) return;
+	cui_draw_chain(obj->next);
+	cui_draw(obj);
+}
+
+void
+cui_hide(cui obj)
+{
+	obj->flags |= CUI_FLG_HIDE;
+	cui_clear(obj);
+}
+
+void
+cui_show(cui obj)
+{
+	obj->flags &= ~CUI_FLG_HIDE;
+	cui_draw(obj);
+}
+
+int
+cui_is_visible(cui obj)
+{
+	if(obj == NULL) return TRUE; /* root */
+	return !(obj->flags & CUI_FLG_HIDE) && cui_is_visible(obj->parent);
 }
 
 void
diff -urN cui17/cui.h cui18/cui.h
--- cui17/cui.h	Thu Jan 30 22:00:00 2014
+++ cui18/cui.h	Thu Jan 30 22:20:00 2014
@@ -18,6 +18,7 @@
 #define CUI_EVT_BUTTON		(1<<2)
 
 #define CUI_FLG_CAN_FOCUS	(1<<0)
+#define CUI_FLG_HIDE		(1<<1)
 
 typedef struct cui_handler_list *cui_handler_list;
 
@@ -40,6 +41,10 @@
 int cui_gx(cui obj);
 int cui_gy(cui obj);
 void cui_draw(cui obj);
+void cui_draw_chain(cui obj);
+void cui_hide(cui obj);
+void cui_show(cui obj);
+int cui_is_visible(cui obj);
 void cui_quit(void);
 void cui_main(cui top_obj);
 void cui_free(cui obj);
diff -urN cui17/label.c cui18/label.c
--- cui17/label.c	Thu Jan 30 22:10:00 2014
+++ cui18/label.c	Thu Jan 30 22:20:00 2014
@@ -39,8 +39,9 @@
 cui_label_str_set(cui obj, char *s)
 {
 	cui_label p = (cui_label)obj;
+	cui_hide(obj);
 	p->s = s;
-	cui_draw(obj);
+	cui_show(obj);
 }
 
 /* EOF */