diff -urN cui16/button.c cui17/button.c
--- cui16/button.c	Thu Jan 30 22:00:00 2014
+++ cui17/button.c	Thu Jan 30 22:10:00 2014
@@ -59,4 +59,10 @@
 	return cui_label_str_get(obj);
 }
 
+void
+cui_button_str_set(cui obj, char *s)
+{
+	cui_label_str_set(obj, s);
+}
+
 /* EOF */
diff -urN cui16/button.h cui17/button.h
--- cui16/button.h	Thu Jan 30 05:30:00 2014
+++ cui17/button.h	Thu Jan 30 22:10:00 2014
@@ -10,5 +10,6 @@
 cui cui_button_new(cui parent, int x, int y, char *s);
 void cui_button_init(cui obj, cui parent, int x, int y, char *s);
 char *cui_button_str_get(cui obj);
+void cui_button_str_set(cui obj, char *s);
 
 #endif
diff -urN cui16/cui_test.c cui17/cui_test.c
--- cui16/cui_test.c	Thu Jan 30 22:00:00 2014
+++ cui17/cui_test.c	Thu Jan 30 22:10:00 2014
@@ -1,12 +1,27 @@
 #include <stdio.h>
 #include "cui.h"
+#include "handler.h"
+#include "label.h"
+#include "button.h"
 #include "dialog.h"
 
 int
+my_hdr(cui obj, int evt, int val, void *prm)
+{
+	cui_simple_dialog p = (cui_simple_dialog)prm;
+	cui_label_str_set(p->label, "Realy ?");
+	cui_button_str_set(p->btn1, "Yes");
+	cui_button_str_set(p->btn2, "No");
+	cui_unbind(obj, CUI_EVT_BUTTON, my_hdr);
+	return TRUE;
+}
+
+int
 main()
 {
 	cui obj = cui_simple_dialog_new(NULL, 2, 2, "Are you sure ?", "OK", "Cancel");
 	cui_simple_dialog p = (cui_simple_dialog)obj;
+	cui_bind(p->btn1, CUI_EVT_BUTTON, my_hdr, p);
 	cui_main(obj);
 	printf("result %s\n", p->btn_result);
 	cui_free(obj);
diff -urN cui16/label.c cui17/label.c
--- cui16/label.c	Thu Jan 30 05:30:00 2014
+++ cui17/label.c	Thu Jan 30 22:10:00 2014
@@ -35,4 +35,12 @@
 	return p->s;
 }
 
+void
+cui_label_str_set(cui obj, char *s)
+{
+	cui_label p = (cui_label)obj;
+	p->s = s;
+	cui_draw(obj);
+}
+
 /* EOF */
diff -urN cui16/label.h cui17/label.h
--- cui16/label.h	Thu Jan 30 05:30:00 2014
+++ cui17/label.h	Thu Jan 30 22:10:00 2014
@@ -12,5 +12,6 @@
 int cui_label_hdr(cui obj, int evt, int val, void *prm);
 void cui_label_init(cui obj, cui parent, int x, int y, char *s);
 char *cui_label_str_get(cui obj);
+void cui_label_str_set(cui obj, char *s);
 
 #endif