diff --git a/xpfe/AppCores/idl/ToolkitCore.idl b/xpfe/AppCores/idl/ToolkitCore.idl
index 6e58ad64597..899721ec751 100644
--- a/xpfe/AppCores/idl/ToolkitCore.idl
+++ b/xpfe/AppCores/idl/ToolkitCore.idl
@@ -4,5 +4,6 @@ interface ToolkitCore : BaseAppCore
     {0x81, 0xb2, 0x00, 0x60, 0x08, 0x3a, 0x0b, 0xcf}} *\
 
 	void ToolkitCore();
+	void ShowDialog(in wstring url, in Window parent);
 	void ShowWindow(in wstring url, in Window parent);
 };
diff --git a/xpfe/AppCores/public/nsIDOMToolkitCore.h b/xpfe/AppCores/public/nsIDOMToolkitCore.h
index 04b215644b9..ebfbc0cc1bf 100644
--- a/xpfe/AppCores/public/nsIDOMToolkitCore.h
+++ b/xpfe/AppCores/public/nsIDOMToolkitCore.h
@@ -35,20 +35,24 @@ class nsIDOMToolkitCore : public nsIDOMBaseAppCore {
 public:
   static const nsIID& GetIID() { static nsIID iid = NS_IDOMTOOLKITCORE_IID; return iid; }
 
+  NS_IMETHOD    ShowDialog(const nsString& aUrl, nsIDOMWindow* aParent)=0;
+
   NS_IMETHOD    ShowWindow(const nsString& aUrl, nsIDOMWindow* aParent)=0;
 };
 
 
 #define NS_DECL_IDOMTOOLKITCORE   \
+  NS_IMETHOD    ShowDialog(const nsString& aUrl, nsIDOMWindow* aParent);  \
   NS_IMETHOD    ShowWindow(const nsString& aUrl, nsIDOMWindow* aParent);  \
 
 
 
 #define NS_FORWARD_IDOMTOOLKITCORE(_to)  \
+  NS_IMETHOD    ShowDialog(const nsString& aUrl, nsIDOMWindow* aParent) { return _to##ShowDialog(aUrl, aParent); }  \
   NS_IMETHOD    ShowWindow(const nsString& aUrl, nsIDOMWindow* aParent) { return _to##ShowWindow(aUrl, aParent); }  \
 
 
-extern nsresult NS_InitToolkitCoreClass(nsIScriptContext *aContext, void **aPrototype);
+extern "C" NS_DOM nsresult NS_InitToolkitCoreClass(nsIScriptContext *aContext, void **aPrototype);
 
 extern "C" NS_DOM nsresult NS_NewScriptToolkitCore(nsIScriptContext *aContext, nsISupports *aSupports, nsISupports *aParent, void **aReturn);
 
diff --git a/xpfe/AppCores/src/nsToolkitCore.cpp b/xpfe/AppCores/src/nsToolkitCore.cpp
index c3791979d7c..a9de73414e4 100644
--- a/xpfe/AppCores/src/nsToolkitCore.cpp
+++ b/xpfe/AppCores/src/nsToolkitCore.cpp
@@ -127,6 +127,44 @@ nsToolkitCore::Init(const nsString& aId) {
 }
 
 
+NS_IMETHODIMP
+nsToolkitCore::ShowDialog(const nsString& aUrl, nsIDOMWindow* aParent) {
+
+  nsresult           rv;
+  nsString           controllerCID;
+  nsIAppShellService *appShell;
+  nsIWidget          *window;
+
+  window = nsnull;
+
+  nsCOMPtr<nsIURL> urlObj;
+  rv = NS_NewURL(getter_AddRefs(urlObj), aUrl);
+  if (NS_FAILED(rv))
+    return rv;
+
+  rv = nsServiceManager::GetService(kAppShellServiceCID, kIAppShellServiceIID,
+                                    (nsISupports**) &appShell);
+  if (NS_FAILED(rv))
+    return rv;
+
+  // hardwired temporary hack.  See nsAppRunner.cpp at main()
+  controllerCID = "43147b80-8a39-11d2-9938-0080c7cb1081";
+
+  nsCOMPtr<nsIWebShellWindow> webWindow = DOMWindowToWebShellWindow(aParent);
+  nsCOMPtr<nsIWidget> parent;
+  if (webWindow)
+    webWindow->GetWidget(*getter_AddRefs(parent));
+
+  appShell->CreateTopLevelWindow(parent, urlObj, controllerCID, window,
+                               nsnull, nsnull, 615, 650);
+  nsServiceManager::ReleaseService(kAppShellServiceCID, appShell);
+
+  if (window != nsnull)
+    window->Show(PR_TRUE);
+
+  return rv;
+}
+
 NS_IMETHODIMP
 nsToolkitCore::ShowWindow(const nsString& aUrl, nsIDOMWindow* aParent) {