+// This style indicates that the window is
+// embedded in the application and must not be
+// destroyed by the help controller.
+#define wxHF_EMBEDDED 0x00008000
+
+// Create a dialog for the help window.
+#define wxHF_DIALOG 0x00010000
+
+// Create a frame for the help window.
+#define wxHF_FRAME 0x00020000
+
+// Make the dialog modal when displaying help.
+#define wxHF_MODAL 0x00040000
+
+class WXDLLIMPEXP_HTML wxHtmlHelpDialog;
+class WXDLLIMPEXP_HTML wxHtmlHelpWindow;
+class WXDLLIMPEXP_HTML wxHtmlHelpFrame;
+class WXDLLIMPEXP_HTML wxHtmlHelpDialog;
+
+class WXDLLIMPEXP_HTML wxHtmlHelpController : public wxHelpControllerBase // wxEvtHandler