Index: base/shell/explorer-new/precomp.h
===================================================================
--- base/shell/explorer-new/precomp.h	(revision 58137)
+++ base/shell/explorer-new/precomp.h	(working copy)
@@ -419,6 +419,7 @@
 
 #define TSWM_ENABLEGROUPING (WM_USER + 1)
 #define TSWM_UPDATETASKBARPOS   (WM_USER + 2)
+#define TSWM_OPENTASKMENU       (WM_USER + 260)
 
 BOOL
 RegisterTaskSwitchWndClass(VOID);
Index: base/shell/explorer-new/traywnd.c
===================================================================
--- base/shell/explorer-new/traywnd.c	(revision 58137)
+++ base/shell/explorer-new/traywnd.c	(working copy)
@@ -2473,6 +2473,10 @@
                 DestroyWindow(hwnd);
                 break;
 
+            case TSWM_OPENTASKMENU:
+                SendMessage(GetParent(This->hwndStart), WM_COMMAND, MAKEWPARAM(BN_CLICKED, IDC_STARTBTN), (LPARAM)This->hwndStart);
+                break;
+
             case WM_COMMAND:
                 if ((HWND)lParam == This->hwndStart)
                 {