Add XRC handler for wxSimplebook.

Similar to wxNotebook but even simpler as wxSimplebook doesn't use images.

Also add wxSimplebook::Create() as the version inherited from wxBookCtrlBase
didn't _quite_ work: we need to add wxBK_TOP style to prevent asserts due to
unknown alignment in the base class when creating wxSimplebook.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@77010 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/xrc/xh_simplebook.h

@@ -0,0 +1,36 @@
+/////////////////////////////////////////////////////////////////////////////
+// Name:        wx/xrc/xh_simplebook.h
+// Purpose:     XML resource handler for wxSimplebook
+// Author:      Vadim Zeitlin
+// Created:     2014-08-05
+// Copyright:   (c) 2014 Vadim Zeitlin
+// Licence:     wxWindows licence
+/////////////////////////////////////////////////////////////////////////////
+
+#ifndef _WX_XH_SIMPLEBOOK_H_
+#define _WX_XH_SIMPLEBOOK_H_
+
+#include "wx/xrc/xmlres.h"
+
+#if wxUSE_XRC && wxUSE_BOOKCTRL
+
+class wxSimplebook;
+
+class WXDLLIMPEXP_XRC wxSimplebookXmlHandler : public wxXmlResourceHandler
+{
+public:
+    wxSimplebookXmlHandler();
+
+    virtual wxObject *DoCreateResource() wxOVERRIDE;
+    virtual bool CanHandle(wxXmlNode *node) wxOVERRIDE;
+
+private:
+    bool m_isInside;
+    wxSimplebook *m_simplebook;
+
+    wxDECLARE_DYNAMIC_CLASS(wxSimplebookXmlHandler);
+};
+
+#endif // wxUSE_XRC && wxUSE_BOOKCTRL
+
+#endif // _WX_XH_SIMPLEBOOK_H_