@@ 108,8 108,7 @@ begin
  
   -- Objects can send events to each other.
   Post_Event
-    (Source => My_Child_1,
-     Target => My_Child_2,
+    (Object => My_Child_2,
      Event  => "Ping");
 
   -- Propagate makes events broadcast to the object's descendants.


@@ 120,7 119,7 @@ begin
      Async     => False,
      Propagate => True);
   Post_Event
-    (Target => My_Parent,
+    (Object => My_Parent,
      Event  => "Ping");
 
   T_IO.Put_Line("My_Parent path = " & Get_Name(My_Parent));

@@ 1187,13 1187,17 @@ restart:
 		case AG_SINK_READ:
 		case AG_SINK_WRITE:
 			es = (AG_EventSink *)kev->udata;
-			es->fn(es, &es->fnArgs);
+			if (es) {
+				es->fn(es, &es->fnArgs);
+			}
 			break;
 		case AG_SINK_FSEVENT:
 		case AG_SINK_PROCEVENT:
 			es = (AG_EventSink *)kev->udata;
-			es->flagsMatched = GetSinkFlags(kev->fflags);
-			es->fn(es, &es->fnArgs);
+			if (es) {
+				es->flagsMatched = GetSinkFlags(kev->fflags);
+				es->fn(es, &es->fnArgs);
+			}
 			break;
 		default:
 			break;


@@ 1289,7 1293,7 @@ AG_EventSinkTIMERFD(void)
 {
 	fd_set rdFds, wrFds;
 	int nFds, rv;
-	AG_EventSink *es;
+	AG_EventSink *es, *esNext;
 	AG_Object *ob, *obNext;
 	AG_Timer *to, *toNext;
 	struct timeval timeo, *pTimeo;


@@ 1374,7 1378,10 @@ restart:
 #  endif /* AG_TIMERS */
 	
 	/* 2. Process I/O events. */
-	TAILQ_FOREACH(es, &agEventSource->sinks, sinks) {
+	for (es = TAILQ_FIRST(&agEventSource->sinks);
+	     es != TAILQ_END(&agEventSource->sinks);
+	     es = esNext) {
+		esNext = TAILQ_NEXT(es, sinks);
 		switch (es->type) {
 		case AG_SINK_READ:
 			if (FD_ISSET(es->ident, &rdFds)) {


@@ 1388,7 1395,6 @@ restart:
 			break;
 		}
 	}
-
 	return (0);
 }
 

@@ 350,6 350,10 @@ AG_ObjectAttach(void *parentp, void *pChld)
 	if (parent == chld)
 		AG_FatalErrorV("E31", "parent == chld");
 #endif
+#ifdef AG_TYPE_SAFETY
+	if (!AG_OBJECT_VALID(parent)) { AG_FatalErrorV("E38a", "Parent object is invalid"); }
+	if (!AG_OBJECT_VALID(chld))   { AG_FatalErrorV("E38b", "Child object is invalid"); }
+#endif
 	AG_LockVFS(parent);
 	AG_ObjectLock(parent);
 	AG_ObjectLock(chld);


@@ 415,7 419,10 @@ AG_ObjectDetach(void *pChld)
 #ifdef AG_TIMERS
 	AG_Timer *to, *toNext;
 #endif
-
+#ifdef AG_TYPE_SAFETY
+	if (!AG_OBJECT_VALID(chld))   { AG_FatalErrorV("E36a", "Child object is invalid"); }
+	if (!AG_OBJECT_VALID(parent)) { AG_FatalErrorV("E36b", "Parent object is invalid"); }
+#endif
 #ifdef AG_THREADS
 	AG_LockVFS(root);
 #endif


@@ 670,15 677,15 @@ AG_ObjectDestroy(void *p)
 	AG_ObjectClass **hier;
 	int i, nHier;
 
+#ifdef AG_TYPE_SAFETY
+	if (!AG_OBJECT_VALID(ob))
+		AG_FatalErrorV("E36", "Object is invalid");
+#endif
 #ifdef AG_DEBUG
 	if (ob->parent != NULL) {
-		AG_Debug(ob, "I'm still attached to %s\n",
-		    OBJECT(ob->parent)->name);
+		AG_Debug(ob, "I'm still attached to %s\n", OBJECT(ob->parent)->name);
 		AG_FatalErrorV("E33", "Object is still attached");
 	}
-# ifdef AG_DEBUG_CORE
-	Debug(ob, "Destroying\n");
-# endif
 #endif
 	AG_ObjectFreeChildren(ob);
 	AG_ObjectReset(ob);


@@ 694,7 701,13 @@ AG_ObjectDestroy(void *p)
 	AG_ObjectFreeVariables(ob);
 	AG_ObjectFreeEvents(ob);
 	AG_MutexDestroy(&ob->pvt.lock);
-
+#ifdef AG_TYPE_SAFETY
+	memcpy(ob->tag, "FreeMem", 7);
+# ifdef AG_DEBUG
+	memcpy(ob->name, "invalid", 7);
+	ob->cls = NULL;
+# endif
+#endif
 	if ((ob->flags & AG_OBJECT_STATIC) == 0)
 		free(ob);
 }

@@ 387,13 387,26 @@ PrintVersion(void)
 /*
  * Debugger command entry
  */
+static void *ExecCmdThread(void *);
+
 static void
 ExecCmd(AG_Event *event)
 {
 	AG_Textbox *tb = AG_TEXTBOX_SELF();
-	char *s = AG_TextboxDupString(tb);
+	AG_Thread th;
+
+	AG_ThreadCreate(&th, ExecCmdThread, tb);
+}
+static void *
+ExecCmdThread(void *arg)
+{
+	AG_Textbox *tb = AGTEXTBOX(arg);
+	char *s;
 	SBStream cmds;
 	
+	AG_OBJECT_ISA(tb, "AG_Widget:AG_Textbox:*");
+
+	s = AG_TextboxDupString(tb);
 	if (strcmp(s, "version") == 0)
 		PrintVersion();
 


@@ 402,6 415,7 @@ ExecCmd(AG_Event *event)
 
 	Agardb::Run_LLDB(cmds, 0);
 	AG_TextboxClearString(tb);
+	return (NULL);
 }
 
 static void


@@ 795,7 809,7 @@ Agardb::GUI::GUI()
 		tb = g_textbox_prompt = AG_TextboxNew(box,
 		    AG_TEXTBOX_EXCL | AG_TEXTBOX_HFILL,
 		    "(lldb)");
-		(AG_SetEvent(tb, "textbox-return", ExecCmd, NULL))->flags |= AG_EVENT_ASYNC;
+		AG_SetEvent(tb, "textbox-return", ExecCmd, NULL);
 	
 		AG_ActionFn(g_console, "Help", ConsoleHelp, NULL);
 		AG_ActionOnKey(g_console, AG_KEY_F1, AG_KEYMOD_ANY, "Help");