Index: base/shell/explorer/taskswnd.cpp
===================================================================
--- base/shell/explorer/taskswnd.cpp	(revision 75519)
+++ base/shell/explorer/taskswnd.cpp	(working copy)
@@ -1541,7 +1541,7 @@
 
         ActivateTask(TaskItem->hWnd);
 
-        ::SendMessageW(TaskItem->hWnd, WM_POPUPSYSTEMMENU, 0, MAKELPARAM(pt.x, pt.y));
+        ::PostMessageW(TaskItem->hWnd, WM_POPUPSYSTEMMENU, 0, MAKELPARAM(pt.x, pt.y));
     }
 
     VOID HandleTaskGroupRightClick(IN OUT PTASK_GROUP TaskGroup)