diff --git a/dlls/uxtheme/tests/msg.h b/dlls/uxtheme/tests/msg.h
new file mode 100644
index 00000000000..1be05499fd4
--- /dev/null
+++ b/dlls/uxtheme/tests/msg.h
@@ -0,0 +1,409 @@
+/* Message Sequence Testing Code
+ *
+ * Copyright (C) 2007 James Hawkins
+ * Copyright (C) 2007 Lei Zhang
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
+#include <assert.h>
+#include <windows.h>
+#include "wine/heap.h"
+#include "wine/test.h"
+
+/* undocumented SWP flags - from SDK 3.1 */
+#define SWP_NOCLIENTSIZE	0x0800
+#define SWP_NOCLIENTMOVE	0x1000
+
+typedef enum
+{
+    sent = 0x1,
+    posted = 0x2,
+    parent = 0x4,
+    wparam = 0x8,
+    lparam = 0x10,
+    defwinproc = 0x20,
+    beginpaint = 0x40,
+    optional = 0x80,
+    hook = 0x100,
+    winevent_hook =0x200,
+    id = 0x400,
+    custdraw = 0x800
+} msg_flags_t;
+
+struct message
+{
+    UINT message;       /* the WM_* code */
+    msg_flags_t flags;  /* message props */
+    WPARAM wParam;      /* expected value of wParam */
+    LPARAM lParam;      /* expected value of lParam */
+    UINT id;            /* extra message data: id of the window,
+                           notify code etc. */
+    DWORD stage;        /* custom draw stage */
+};
+
+struct msg_sequence
+{
+    int count;
+    int size;
+    struct message *sequence;
+};
+
+static void add_message(struct msg_sequence **seq, int sequence_index,
+    const struct message *msg)
+{
+    struct msg_sequence *msg_seq = seq[sequence_index];
+
+    if (!msg_seq->sequence)
+    {
+        msg_seq->size = 10;
+        msg_seq->sequence = heap_alloc(msg_seq->size * sizeof (*msg_seq->sequence));
+    }
+
+    if (msg_seq->count == msg_seq->size)
+    {
+        msg_seq->size *= 2;
+        msg_seq->sequence = heap_realloc(msg_seq->sequence, msg_seq->size * sizeof (*msg_seq->sequence));
+    }
+
+    assert(msg_seq->sequence);
+
+    msg_seq->sequence[msg_seq->count] = *msg;
+    msg_seq->count++;
+}
+
+static inline void flush_sequence(struct msg_sequence **seg, int sequence_index)
+{
+    struct msg_sequence *msg_seq = seg[sequence_index];
+    heap_free(msg_seq->sequence);
+    msg_seq->sequence = NULL;
+    msg_seq->count = msg_seq->size = 0;
+}
+
+static inline void flush_sequences(struct msg_sequence **seq, int n)
+{
+    int i;
+
+    for (i = 0; i < n; i++)
+        flush_sequence(seq, i);
+}
+
+static void dump_sequence( struct msg_sequence **seq, int sequence_index,
+                           const struct message *expected, const char *context,
+                           const char *file, int line )
+{
+    struct msg_sequence *msg_seq = seq[sequence_index];
+    const struct message *actual, *sequence;
+    unsigned int count = 0;
+
+    sequence = msg_seq->sequence;
+    actual = sequence;
+
+    trace_(file, line)("Failed sequence %s:\n", context );
+    while (expected->message && actual->message)
+    {
+        trace_(file, line)( "  %u: expected: %04x - actual: %04x wp %08lx lp %08lx\n",
+                            count, expected->message, actual->message, actual->wParam, actual->lParam );
+
+        if (expected->message == actual->message)
+        {
+            if ((expected->flags & defwinproc) != (actual->flags & defwinproc) &&
+                (expected->flags & optional))
+            {
+                /* don't match messages if their defwinproc status differs */
+                expected++;
+            }
+            else
+            {
+                expected++;
+                actual++;
+            }
+        }
+        else
+        {
+            expected++;
+            actual++;
+        }
+        count++;
+    }
+
+    /* optional trailing messages */
+    while (expected->message && expected->flags & optional)
+    {
+        trace_(file, line)( "  %u: expected: msg %04x - actual: nothing\n", count, expected->message );
+        expected++;
+        count++;
+    }
+
+    if (expected->message)
+    {
+        trace_(file, line)( "  %u: expected: msg %04x - actual: nothing\n", count, expected->message );
+        return;
+    }
+
+    while (actual->message)
+    {
+        trace_(file, line)( "  %u: expected: nothing - actual: %04x wp %08lx lp %08lx\n",
+                            count, actual->message, actual->wParam, actual->lParam );
+        actual++;
+        count++;
+    }
+}
+
+static void ok_sequence_(struct msg_sequence **seq, int sequence_index,
+    const struct message *expected_list, const char *context, BOOL todo,
+    const char *file, int line)
+{
+    static const struct message end_of_sequence = {0, 0, 0, 0};
+    struct msg_sequence *msg_seq = seq[sequence_index];
+    const struct message *expected = expected_list;
+    const struct message *actual, *sequence;
+    int failcount = 0, dump = 0;
+
+    add_message(seq, sequence_index, &end_of_sequence);
+
+    sequence = msg_seq->sequence;
+    actual = sequence;
+
+    while (expected->message && actual->message)
+    {
+        if (expected->message == actual->message)
+        {
+            if (expected->flags & wparam)
+            {
+                if (expected->wParam != actual->wParam && todo)
+                {
+                    todo_wine
+                    {
+                        failcount++;
+                        dump++;
+                        ok_(file, line) (FALSE,
+                            "%s: in msg 0x%04x expecting wParam 0x%lx got 0x%lx\n",
+                            context, expected->message, expected->wParam, actual->wParam);
+                    }
+                }
+                else
+                {
+                    ok_(file, line) (expected->wParam == actual->wParam,
+                        "%s: in msg 0x%04x expecting wParam 0x%lx got 0x%lx\n",
+                        context, expected->message, expected->wParam, actual->wParam);
+                    if (expected->wParam != actual->wParam) dump++;
+                }
+            }
+
+            if (expected->flags & lparam)
+            {
+                if (expected->lParam != actual->lParam && todo)
+                {
+                    todo_wine
+                    {
+                        failcount++;
+                        dump++;
+                        ok_(file, line) (FALSE,
+                            "%s: in msg 0x%04x expecting lParam 0x%lx got 0x%lx\n",
+                            context, expected->message, expected->lParam, actual->lParam);
+                    }
+                }
+                else
+                {
+                    ok_(file, line) (expected->lParam == actual->lParam,
+                        "%s: in msg 0x%04x expecting lParam 0x%lx got 0x%lx\n",
+                        context, expected->message, expected->lParam, actual->lParam);
+                    if (expected->lParam != actual->lParam) dump++;
+                }
+            }
+
+            if (expected->flags & custdraw)
+            {
+                if (expected->stage != actual->stage && todo)
+                {
+                    todo_wine
+                    {
+                        failcount++;
+                        dump++;
+                        ok_(file, line) (FALSE,
+                            "%s: in msg 0x%04x expecting cd stage 0x%08x got 0x%08x\n",
+                            context, expected->message, expected->stage, actual->stage);
+                    }
+                }
+                else
+                {
+                    ok_(file, line) (expected->stage == actual->stage,
+                        "%s: in msg 0x%04x expecting cd stage 0x%08x got 0x%08x\n",
+                        context, expected->message, expected->stage, actual->stage);
+                    if (expected->stage != actual->stage) dump++;
+                }
+            }
+
+            if (expected->flags & id)
+            {
+                if (expected->id != actual->id && expected->flags & optional)
+                {
+                    expected++;
+                    continue;
+                }
+                if (expected->id != actual->id && todo)
+                {
+                    todo_wine
+                    {
+                        failcount++;
+                        dump++;
+                        ok_(file, line) (FALSE,
+                            "%s: in msg 0x%04x expecting id 0x%x got 0x%x\n",
+                            context, expected->message, expected->id, actual->id);
+                    }
+                }
+                else
+                {
+                    ok_(file, line) (expected->id == actual->id,
+                        "%s: in msg 0x%04x expecting id 0x%x got 0x%x\n",
+                        context, expected->message, expected->id, actual->id);
+                    if (expected->id != actual->id) dump++;
+                }
+            }
+
+            if ((expected->flags & defwinproc) != (actual->flags & defwinproc) && todo)
+            {
+                todo_wine
+                {
+                    failcount++;
+                    dump++;
+                    ok_(file, line) (FALSE,
+                        "%s: the msg 0x%04x should %shave been sent by DefWindowProc\n",
+                        context, expected->message, (expected->flags & defwinproc) ? "" : "NOT ");
+                }
+            }
+            else
+            {
+                ok_(file, line) ((expected->flags & defwinproc) == (actual->flags & defwinproc),
+                    "%s: the msg 0x%04x should %shave been sent by DefWindowProc\n",
+                    context, expected->message, (expected->flags & defwinproc) ? "" : "NOT ");
+                if ((expected->flags & defwinproc) != (actual->flags & defwinproc)) dump++;
+            }
+
+            ok_(file, line) ((expected->flags & beginpaint) == (actual->flags & beginpaint),
+                "%s: the msg 0x%04x should %shave been sent by BeginPaint\n",
+                context, expected->message, (expected->flags & beginpaint) ? "" : "NOT ");
+            if ((expected->flags & beginpaint) != (actual->flags & beginpaint)) dump++;
+
+            if (((expected->flags & (sent|posted)) != (actual->flags & (sent|posted))) && todo)
+            {
+                todo_wine
+                {
+                    failcount++;
+                    dump++;
+                    ok_(file, line) (FALSE,
+                        "%s: the msg 0x%04x should have been %s\n",
+                        context, expected->message, (expected->flags & posted) ? "posted" : "sent");
+                }
+            }
+            else
+            {
+                ok_(file, line) ((expected->flags & (sent|posted)) == (actual->flags & (sent|posted)),
+                    "%s: the msg 0x%04x should have been %s\n",
+                    context, expected->message, (expected->flags & posted) ? "posted" : "sent");
+                if ((expected->flags & (sent|posted)) != (actual->flags & (sent|posted))) dump++;
+            }
+
+            ok_(file, line) ((expected->flags & parent) == (actual->flags & parent),
+                "%s: the msg 0x%04x was expected in %s\n",
+                context, expected->message, (expected->flags & parent) ? "parent" : "child");
+            if ((expected->flags & parent) != (actual->flags & parent)) dump++;
+
+            ok_(file, line) ((expected->flags & hook) == (actual->flags & hook),
+                "%s: the msg 0x%04x should have been sent by a hook\n",
+                context, expected->message);
+            if ((expected->flags & hook) != (actual->flags & hook)) dump++;
+
+            ok_(file, line) ((expected->flags & winevent_hook) == (actual->flags & winevent_hook),
+                "%s: the msg 0x%04x should have been sent by a winevent hook\n",
+                context, expected->message);
+            if ((expected->flags & winevent_hook) != (actual->flags & winevent_hook)) dump++;
+
+            expected++;
+            actual++;
+        }
+        else if (expected->flags & optional)
+            expected++;
+        else if (todo)
+        {
+            failcount++;
+            dump++;
+            todo_wine
+            {
+                ok_(file, line) (FALSE, "%s: the msg 0x%04x was expected, but got msg 0x%04x instead\n",
+                    context, expected->message, actual->message);
+            }
+            goto done;
+        }
+        else
+        {
+            ok_(file, line) (FALSE, "%s: the msg 0x%04x was expected, but got msg 0x%04x instead\n",
+                context, expected->message, actual->message);
+            dump++;
+            expected++;
+            actual++;
+        }
+    }
+
+    /* skip all optional trailing messages */
+    while (expected->message && ((expected->flags & optional)))
+        expected++;
+
+    if (todo)
+    {
+        todo_wine
+        {
+            if (expected->message || actual->message)
+            {
+                failcount++;
+                dump++;
+                ok_(file, line) (FALSE, "%s: the msg sequence is not complete: expected %04x - actual %04x\n",
+                    context, expected->message, actual->message);
+            }
+        }
+    }
+    else if (expected->message || actual->message)
+    {
+        dump++;
+        ok_(file, line) (FALSE, "%s: the msg sequence is not complete: expected %04x - actual %04x\n",
+            context, expected->message, actual->message);
+    }
+
+    if(todo && !failcount) /* succeeded yet marked todo */
+    {
+        if (!strcmp(winetest_platform, "wine")) dump++;
+        todo_wine
+        {
+            ok_(file, line)(TRUE, "%s: marked \"todo_wine\" but succeeds\n", context);
+        }
+    }
+
+done:
+    if (dump) dump_sequence( seq, sequence_index, expected_list, context, file, line );
+    flush_sequence(seq, sequence_index);
+}
+
+#define ok_sequence(seq, index, exp, contx, todo) \
+        ok_sequence_(seq, index, (exp), (contx), (todo), __FILE__, __LINE__)
+
+
+static void init_msg_sequences(struct msg_sequence **seq, int n)
+{
+    int i;
+
+    for (i = 0; i < n; i++)
+        seq[i] = heap_alloc_zero(sizeof(*seq[i]));
+}
diff --git a/dlls/uxtheme/tests/system.c b/dlls/uxtheme/tests/system.c
index 3f259d08f79..e008319e82a 100644
--- a/dlls/uxtheme/tests/system.c
+++ b/dlls/uxtheme/tests/system.c
@@ -24,6 +24,7 @@
 #include "vfwmsgs.h"
 #include "uxtheme.h"
 
+#include "msg.h"
 #include "wine/test.h"
 
 static HTHEME  (WINAPI * pOpenThemeDataEx)(HWND, LPCWSTR, DWORD);
@@ -35,6 +36,16 @@ static HDC (WINAPI *pGetBufferedPaintDC)(HPAINTBUFFER);
 static HDC (WINAPI *pGetBufferedPaintTargetDC)(HPAINTBUFFER);
 static HRESULT (WINAPI *pGetBufferedPaintTargetRect)(HPAINTBUFFER, RECT *);
 
+/* For message tests */
+enum seq_index
+{
+    PARENT_SEQ_INDEX,
+    CHILD_SEQ_INDEX,
+    NUM_MSG_SEQUENCES
+};
+
+static struct msg_sequence *sequences[NUM_MSG_SEQUENCES];
+
 static void init_funcs(void)
 {
     HMODULE hUxtheme = GetModuleHandleA("uxtheme.dll");
@@ -53,6 +64,72 @@ static void init_funcs(void)
 #undef UXTHEME_GET_PROC
 }
 
+/* Try to make sure pending X events have been processed before continuing */
+static void flush_events(void)
+{
+    MSG msg;
+    int diff = 200;
+    int min_timeout = 100;
+    DWORD time = GetTickCount() + diff;
+
+    while (diff > 0)
+    {
+        if (MsgWaitForMultipleObjects(0, NULL, FALSE, min_timeout, QS_ALLINPUT) == WAIT_TIMEOUT)
+            break;
+        while (PeekMessageA(&msg, 0, 0, 0, PM_REMOVE))
+            DispatchMessageA(&msg);
+        diff = time - GetTickCount();
+    }
+}
+
+static LRESULT WINAPI TestSetWindowThemeParentProcA(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
+{
+    static LONG defwndproc_counter;
+    struct message msg = {0};
+    LRESULT ret;
+
+    /* Only care about WM_THEMECHANGED */
+    if (message != WM_THEMECHANGED)
+        return DefWindowProcA(hwnd, message, wParam, lParam);
+
+    msg.message = message;
+    msg.flags = sent | wparam | lparam;
+    if (defwndproc_counter)
+        msg.flags |= defwinproc;
+    msg.wParam = wParam;
+    msg.lParam = lParam;
+    add_message(sequences, PARENT_SEQ_INDEX, &msg);
+
+    InterlockedIncrement(&defwndproc_counter);
+    ret = DefWindowProcA(hwnd, message, wParam, lParam);
+    InterlockedDecrement(&defwndproc_counter);
+    return ret;
+}
+
+static LRESULT WINAPI TestSetWindowThemeChildProcA(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
+{
+    static LONG defwndproc_counter;
+    struct message msg = {0};
+    LRESULT ret;
+
+    /* Only care about WM_THEMECHANGED */
+    if (message != WM_THEMECHANGED)
+        return DefWindowProcA(hwnd, message, wParam, lParam);
+
+    msg.message = message;
+    msg.flags = sent | wparam | lparam;
+    if (defwndproc_counter)
+        msg.flags |= defwinproc;
+    msg.wParam = wParam;
+    msg.lParam = lParam;
+    add_message(sequences, CHILD_SEQ_INDEX, &msg);
+
+    InterlockedIncrement(&defwndproc_counter);
+    ret = DefWindowProcA(hwnd, message, wParam, lParam);
+    InterlockedDecrement(&defwndproc_counter);
+    return ret;
+}
+
 static void test_IsThemed(void)
 {
     BOOL bThemeActive;
@@ -100,16 +177,72 @@ static void test_GetWindowTheme(void)
     DestroyWindow(hWnd);
 }
 
+static const struct message SetWindowThemeSeq[] =
+{
+    {WM_THEMECHANGED, sent},
+    {0}
+};
+
+static const struct message EmptySeq[] =
+{
+    {0}
+};
+
 static void test_SetWindowTheme(void)
 {
-    HTHEME  hTheme;
+    WNDCLASSA cls = {0};
+    HWND hWnd, child;
+    HTHEME hTheme;
     HRESULT hRes;
-    HWND    hWnd;
+    MSG msg;
 
     hRes = SetWindowTheme(NULL, NULL, NULL);
 todo_wine
     ok( hRes == E_HANDLE, "Expected E_HANDLE, got 0x%08x\n", hRes);
 
+    /* Test that WM_THEMECHANGED is sent and not posted to windows */
+    cls.hInstance = GetModuleHandleA(0);
+    cls.hCursor = LoadCursorA(0, (LPCSTR)IDC_ARROW);
+    cls.hbrBackground = GetStockObject(WHITE_BRUSH);
+    cls.lpfnWndProc = TestSetWindowThemeParentProcA;
+    cls.lpszClassName = "TestSetWindowThemeParentClass";
+    RegisterClassA(&cls);
+
+    cls.lpfnWndProc = TestSetWindowThemeChildProcA;
+    cls.lpszClassName = "TestSetWindowThemeChildClass";
+    RegisterClassA(&cls);
+
+    hWnd = CreateWindowA("TestSetWindowThemeParentClass", "parent",
+                         WS_OVERLAPPEDWINDOW | WS_VISIBLE, 100, 100, 200, 200, 0, 0, 0, NULL);
+    ok(!!hWnd, "Failed to create a parent window.\n");
+    child = CreateWindowA("TestSetWindowThemeChildClass", "child", WS_CHILD | WS_VISIBLE, 0, 0, 50,
+                          50, hWnd, 0, 0, NULL);
+    ok(!!child, "Failed to create a child window.\n");
+    flush_events();
+    flush_sequences(sequences, NUM_MSG_SEQUENCES);
+
+    hRes = SetWindowTheme(hWnd, NULL, NULL);
+    ok(hRes == S_OK, "Expected %#x, got %#x.\n", S_OK, hRes);
+    while (PeekMessageA(&msg, 0, 0, 0, PM_REMOVE))
+    {
+        struct message recv_msg = {0};
+
+        if (msg.message == WM_THEMECHANGED)
+        {
+            recv_msg.message = msg.message;
+            recv_msg.flags = posted | wparam | lparam;
+            recv_msg.wParam = msg.wParam;
+            recv_msg.lParam = msg.lParam;
+            add_message(sequences, msg.hwnd == hWnd ? PARENT_SEQ_INDEX : CHILD_SEQ_INDEX, &recv_msg);
+        }
+        DispatchMessageA(&msg);
+    }
+    ok_sequence(sequences, PARENT_SEQ_INDEX, SetWindowThemeSeq, "SetWindowTheme parent", TRUE);
+    ok_sequence(sequences, CHILD_SEQ_INDEX, EmptySeq, "SetWindowTheme child", TRUE);
+    DestroyWindow(hWnd);
+    UnregisterClassA("TestSetWindowThemeParentClass", GetModuleHandleA(0));
+    UnregisterClassA("TestSetWindowThemeChildClass", GetModuleHandleA(0));
+
     /* Only do the bare minimum to get a valid hwnd */
     hWnd = CreateWindowExA(0, "button", "test", WS_POPUP, 0, 0, 100, 100, 0, 0, 0, NULL);
     ok(hWnd != NULL, "Failed to create a test window.\n");
@@ -750,6 +883,7 @@ todo_wine
 START_TEST(system)
 {
     init_funcs();
+    init_msg_sequences(sequences, NUM_MSG_SEQUENCES);
 
     /* No real functional theme API tests will be done (yet). The current tests
      * only show input/return behaviour