diff --git a/dlls/msctf/msctf_internal.h b/dlls/msctf/msctf_internal.h
index 9d375483616..71ed10bb8dd 100644
--- a/dlls/msctf/msctf_internal.h
+++ b/dlls/msctf/msctf_internal.h
@@ -32,6 +32,7 @@
 #define COOKIE_MAGIC_DMSINK 0x0070
 #define COOKIE_MAGIC_THREADFOCUSSINK 0x0080
 #define COOKIE_MAGIC_KEYTRACESINK 0x0090
+#define COOKIE_MAGIC_UIELEMENTSINK 0x00a0
 
 extern DWORD tlsIndex DECLSPEC_HIDDEN;
 extern TfClientId processId DECLSPEC_HIDDEN;
diff --git a/dlls/msctf/tests/inputprocessor.c b/dlls/msctf/tests/inputprocessor.c
index 0d03ce3a8a1..d440b536764 100644
--- a/dlls/msctf/tests/inputprocessor.c
+++ b/dlls/msctf/tests/inputprocessor.c
@@ -64,7 +64,7 @@ static DWORD tmSinkCookie;
 static DWORD tmSinkRefCount;
 static DWORD dmSinkCookie;
 static DWORD documentStatus;
-static DWORD key_trace_sink_cookie;
+static DWORD key_trace_sink_cookie, ui_element_sink_cookie;
 static ITfDocumentMgr *test_CurrentFocus = NULL;
 static ITfDocumentMgr *test_PrevFocus = NULL;
 static ITfDocumentMgr *test_LastCurrentFocus = FOCUS_SAVE;
@@ -671,6 +671,60 @@ static const ITfKeyTraceEventSinkVtbl TfKeyTraceEventSinkVtbl = {
 
 static ITfKeyTraceEventSink TfKeyTraceEventSink = { &TfKeyTraceEventSinkVtbl };
 
+static HRESULT WINAPI TfUIElementSink_QueryInterface(ITfUIElementSink *iface,
+        REFIID riid, void **ppvObject)
+{
+    if(IsEqualGUID(&IID_IUnknown, riid) || IsEqualGUID(&IID_ITfUIElementSink, riid)){
+        *ppvObject = iface;
+        return S_OK;
+    }
+
+    *ppvObject = NULL;
+    return E_NOINTERFACE;
+}
+
+static ULONG WINAPI TfUIElementSink_AddRef(ITfUIElementSink *iface)
+{
+    return 2;
+}
+
+static ULONG WINAPI TfUIElementSink_Release(ITfUIElementSink *iface)
+{
+    return 1;
+}
+
+static HRESULT WINAPI TfUIElementSink_BeginUIElement(ITfUIElementSink *iface,
+        DWORD id, BOOL *show)
+{
+    ok(0, "unexpected call\n");
+    return E_NOTIMPL;
+}
+
+static HRESULT WINAPI TfUIElementSink_UpdateUIElement(ITfUIElementSink *iface,
+        DWORD id)
+{
+    ok(0, "unexpected call\n");
+    return E_NOTIMPL;
+}
+
+static HRESULT WINAPI TfUIElementSink_EndUIElement(ITfUIElementSink *iface,
+        DWORD id)
+{
+    ok(0, "unexpected call\n");
+    return E_NOTIMPL;
+}
+
+static const ITfUIElementSinkVtbl TfUIElementSinkVtbl = {
+    TfUIElementSink_QueryInterface,
+    TfUIElementSink_AddRef,
+    TfUIElementSink_Release,
+    TfUIElementSink_BeginUIElement,
+    TfUIElementSink_UpdateUIElement,
+    TfUIElementSink_EndUIElement
+};
+
+static ITfUIElementSink TfUIElementSink = { &TfUIElementSinkVtbl };
+
 static HRESULT WINAPI TfTransitoryExtensionSink_QueryInterface(ITfTransitoryExtensionSink *iface, REFIID riid, void **ppv)
 {
     if(IsEqualGUID(&IID_IUnknown, riid) || IsEqualGUID(&IID_ITfTransitoryExtensionSink, riid)) {
@@ -1128,7 +1182,7 @@ static void test_ThreadMgrAdviseSinks(void)
     tmSinkRefCount = 1;
     tmSinkCookie = 0;
     hr = ITfSource_AdviseSink(source,&IID_ITfThreadMgrEventSink, sink, &tmSinkCookie);
-    ok(hr == S_OK, "Failed to Advise Sink\n");
+    ok(hr == S_OK, "Failed to Advise ITfThreadMgrEventSink\n");
     ok(tmSinkCookie!=0,"Failed to get sink cookie\n");
 
     /* Advising the sink adds a ref, Releasing here lets the object be deleted
@@ -1138,7 +1192,11 @@ static void test_ThreadMgrAdviseSinks(void)
 
     hr = ITfSource_AdviseSink(source, &IID_ITfKeyTraceEventSink, (IUnknown*)&TfKeyTraceEventSink,
                               &key_trace_sink_cookie);
-    ok(hr == S_OK, "Failed to Advise Sink\n");
+    ok(hr == S_OK, "Failed to Advise ITfKeyTraceEventSink\n");
+
+    hr = ITfSource_AdviseSink(source, &IID_ITfUIElementSink, (IUnknown*)&TfUIElementSink,
+                              &ui_element_sink_cookie);
+    ok(hr == S_OK, "Failed to Advise ITfUIElementSink\n");
 
     ITfSource_Release(source);
 }
@@ -1155,10 +1213,13 @@ static void test_ThreadMgrUnadviseSinks(void)
 
     tmSinkRefCount = 1;
     hr = ITfSource_UnadviseSink(source, tmSinkCookie);
-    ok(hr == S_OK, "Failed to unadvise Sink\n");
+    ok(hr == S_OK, "Failed to unadvise ITfThreadMgrEventSink\n");
 
     hr = ITfSource_UnadviseSink(source, key_trace_sink_cookie);
-    ok(hr == S_OK, "Failed to unadvise Sink\n");
+    ok(hr == S_OK, "Failed to unadvise ITfKeyTraceEventSink\n");
+
+    hr = ITfSource_UnadviseSink(source, ui_element_sink_cookie);
+    ok(hr == S_OK, "Failed to unadvise ITfUIElementSink\n");
 
     ITfSource_Release(source);
 }
diff --git a/dlls/msctf/threadmgr.c b/dlls/msctf/threadmgr.c
index a9fcb5cd15c..7afef3cdd53 100644
--- a/dlls/msctf/threadmgr.c
+++ b/dlls/msctf/threadmgr.c
@@ -96,6 +96,7 @@ typedef struct tagACLMulti {
     struct list     PreservedKeyNotifySink;
     struct list     ThreadFocusSink;
     struct list     ThreadMgrEventSink;
+    struct list     UIElementSink;
 } ThreadMgr;
 
 typedef struct tagEnumTfDocumentMgr {
@@ -172,6 +173,7 @@ static void ThreadMgr_Destructor(ThreadMgr *This)
     free_sinks(&This->PreservedKeyNotifySink);
     free_sinks(&This->ThreadFocusSink);
     free_sinks(&This->ThreadMgrEventSink);
+    free_sinks(&This->UIElementSink);
 
     LIST_FOR_EACH_SAFE(cursor, cursor2, &This->CurrentPreservedKeys)
     {
@@ -624,6 +626,13 @@ static HRESULT WINAPI ThreadMgrSource_AdviseSink(ITfSource *iface,
                            COOKIE_MAGIC_KEYTRACESINK, punk, pdwCookie);
     }
 
+    if (IsEqualIID(riid, &IID_ITfUIElementSink))
+    {
+        WARN("semi-stub for ITfUIElementSink: sink won't be used.\n");
+        return advise_sink(&This->UIElementSink, &IID_ITfUIElementSink,
+                           COOKIE_MAGIC_UIELEMENTSINK, punk, pdwCookie);
+    }
+
     FIXME("(%p) Unhandled Sink: %s\n",This,debugstr_guid(riid));
     return E_NOTIMPL;
 }
@@ -637,7 +646,7 @@ static HRESULT WINAPI ThreadMgrSource_UnadviseSink(ITfSource *iface, DWORD pdwCo
 
     magic = get_Cookie_magic(pdwCookie);
     if (magic != COOKIE_MAGIC_TMSINK && magic != COOKIE_MAGIC_THREADFOCUSSINK
-        && magic != COOKIE_MAGIC_KEYTRACESINK)
+        && magic != COOKIE_MAGIC_KEYTRACESINK && magic != COOKIE_MAGIC_UIELEMENTSINK)
         return E_INVALIDARG;
 
     return unadvise_sink(pdwCookie);
@@ -1354,6 +1363,7 @@ HRESULT ThreadMgr_Constructor(IUnknown *pUnkOuter, IUnknown **ppOut)
     list_init(&This->PreservedKeyNotifySink);
     list_init(&This->ThreadFocusSink);
     list_init(&This->ThreadMgrEventSink);
+    list_init(&This->UIElementSink);
 
     TRACE("returning %p\n", This);
     *ppOut = (IUnknown *)&This->ITfThreadMgrEx_iface;
diff --git a/include/msctf.idl b/include/msctf.idl
index 01e944cf5df..5ef33119fd8 100644
--- a/include/msctf.idl
+++ b/include/msctf.idl
@@ -1136,6 +1136,25 @@ interface ITfKeyTraceEventSink : IUnknown
         [in] LPARAM lParam);
 }
 
+[
+  object,
+  local,
+  uuid(ea1ea136-19df-11d7-a6d2-00065b84435c),
+  pointer_default(unique)
+]
+interface ITfUIElementSink : IUnknown
+{
+    HRESULT BeginUIElement(
+        [in] DWORD id,
+        [in, out] BOOL *show);
+
+    HRESULT UpdateUIElement(
+        [in] DWORD id);
+
+    HRESULT EndUIElement(
+        [in] DWORD id);
+}
+
 [
   object,
   local,