Adding GetPrevSibling() & GetNextSibling() in winundef.h

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@3505 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/winundef.h

@@ -207,6 +207,26 @@
     }
 #endif
 
+// GetPrevSibling
+
+#ifdef GetPrevSibling
+    #undef GetPrevSibling
+    inline HWND GetPrevSibling(HWND hwnd)
+    {
+        return GetWindow(hwnd,GW_HWNDPREV);
+    }
+#endif
+
+// GetNextSibling
+
+#ifdef GetNextSibling
+    #undef GetNextSibling
+    inline HWND GetNextSibling(HWND hwnd)
+    {
+        return GetWindow(hwnd,GW_HWNDNEXT);
+    }
+#endif
+
 // For WINE
 
 #if defined(GetWindowStyle) || defined(__WXWINE__)