Added flag and notification definitions for ComboBoxEx.

diff --git a/include/commctrl.h b/include/commctrl.h
index 181b487..0324a7b 100644
--- a/include/commctrl.h
+++ b/include/commctrl.h
@@ -3118,9 +3118,30 @@
 #define CBEM_SETUNICODEFORMAT   CCM_SETUNICODEFORMAT
 #define CBEM_GETUNICODEFORMAT   CCM_GETUNICODEFORMAT
 
+#define CBEIF_TEXT              0x00000001
+#define CBEIF_IMAGE             0x00000002
+#define CBEIF_SELECTEDIMAGE     0x00000004
+#define CBEIF_OVERLAY           0x00000008
+#define CBEIF_INDENT            0x00000010
+#define CBEIF_LPARAM            0x00000020
+#define CBEIF_DI_SETITEM        0x10000000
+
 #define CBEN_FIRST              (0U-800U)
 #define CBEN_LAST               (0U-830U)
 
+#define CBEN_GETDISPINFOA       (CBEN_FIRST - 0)
+#define CBEN_GETDISPINFOW       (CBEN_FIRST - 7)
+#define CBEN_GETDISPINFO WINELIB_NAME_AW(CBEN_GETDISPINFO)
+#define CBEN_INSERTITEM         (CBEN_FIRST - 1)
+#define CBEN_DELETEITEM         (CBEN_FIRST - 2)
+#define CBEN_BEGINEDIT          (CBEN_FIRST - 4)
+#define CBEN_ENDEDITA           (CBEN_FIRST - 5)
+#define CBEN_ENDEDITW           (CBEN_FIRST - 6)
+#define CBEN_ENDEDIT WINELIB_NAME_AW(CBEN_ENDEDIT)
+#define CBEN_DRAGBEGINA         (CBEN_FIRST - 8)
+#define CBEN_DRAGBEGINW         (CBEN_FIRST - 9)
+#define CBEN_DRAGBEGIN WINELIB_NAME_AW(CBEN_DRAGBEGIN)
+
 typedef struct tagCOMBOBOXEXITEMA
 {
     UINT mask;