diff --git a/sdk/include/psdk/commctrl.h b/sdk/include/psdk/commctrl.h
index 9c997410838..942d07c0883 100644
--- a/sdk/include/psdk/commctrl.h
+++ b/sdk/include/psdk/commctrl.h
@@ -242,9 +242,20 @@ extern "C" {
 #define WMN_LAST (0U-1200U)
 #endif
 
+#define BCSIF_GLYPH 0x00000001
+#define BCSIF_IMAGE 0x00000002
+#define BCSIF_STYLE 0x00000004
+#define BCSIF_SIZE  0x00000008
+
+#define BCSS_STRETCH 0x00000002
+#define BCSS_IMAGE   0x00000008
+
 #define BCN_FIRST (0U-1250U)
 #define BCN_LAST (0U-1350U)
 
+#define BCN_HOTITEMCHANGE (BCN_FIRST + 1)
+#define BCN_DROPDOWN (BCN_FIRST + 2)
+
 #define MSGF_COMMCTRL_BEGINDRAG 0x4200
 #define MSGF_COMMCTRL_SIZEHEADER 0x4201
 #define MSGF_COMMCTRL_DRAGSELECT 0x4202
@@ -910,6 +921,19 @@ extern "C" {
 
 #endif /* !NOHEADER */
 
+typedef struct tagBUTTON_SPLITINFO {
+  UINT mask;
+  HIMAGELIST himlGlyph;
+  UINT uSplitStyle;
+  SIZE size;
+} BUTTON_SPLITINFO, *PBUTTON_SPLITINFO;
+
+typedef struct tagNMBCDROPDOWN {
+  NMHDR hdr;
+  RECT rcButton;
+} NMBCDROPDOWN;
+
+
 #ifndef NOTOOLBAR
 
 #define TOOLBARCLASSNAMEW L"ToolbarWindow32"
@@ -4625,6 +4649,9 @@ typedef struct {
 #define BCM_SETSHIELD (BCM_FIRST+0xC)
 #define Button_SetElevationRequiredState(hwnd,frequired) (BOOL)SNDMSG((hwnd),BCM_SETSHIELD,0,(LPARAM)(frequired))
 
+#define BCM_SETDROPDOWNSTATE (BCM_FIRST + 6)
+#define BCM_SETSPLITINFO (BCM_FIRST + 7)
+#define BCM_GETSPLITINFO (BCM_FIRST + 8)
 #define BCM_SETNOTE (BCM_FIRST + 9)
 #define BCM_GETNOTE (BCM_FIRST + 10)
 #define BCM_GETNOTELENGTH (BCM_FIRST + 11)
@@ -4634,8 +4661,6 @@ typedef struct {
     DWORD dwFlags;
   } NMBCHOTITEM,*LPNMBCHOTITEM;
 
-#define BCN_HOTITEMCHANGE (BCN_FIRST+0x1)
-
 #define BST_HOT 0x200
 
 #define BS_SPLITBUTTON    0x0000000C