-class WXDLLEXPORT wxFrame;
-class WXDLLEXPORT wxMenuBar;
-class WXDLLEXPORT wxStatusBar;
-class WXDLLEXPORT wxToolBar;
+class WXDLLIMPEXP_FWD_CORE wxFrame;
+class WXDLLIMPEXP_FWD_CORE wxMenuBar;
+class WXDLLIMPEXP_FWD_CORE wxStatusBar;
+class WXDLLIMPEXP_FWD_CORE wxToolBar;
+
+// ----------------------------------------------------------------------------
+// constants
+// ----------------------------------------------------------------------------
+
+// wxFrame-specific (i.e. not for wxDialog) styles
+#define wxFRAME_NO_TASKBAR 0x0002 // No taskbar button (MSW only)
+#define wxFRAME_TOOL_WINDOW 0x0004 // No taskbar button, no system menu
+#define wxFRAME_FLOAT_ON_PARENT 0x0008 // Always above its parent
+#define wxFRAME_SHAPED 0x0010 // Create a window that is able to be shaped