动态事件connect 需要使用wxEVT_COMMAND_BUTTON_CLICKED事件，而不是wxEVT_KEY_DOWN
wxButton *toclip = new wxButton(books,ID_BUTTON_TO_CLIP, wxT("复制剪贴板"), wxPoint(x,y));
toclip ->Connect(wxEVT_COMMAND_BUTTON_CLICKED ,wxCommandEventHandler(GlobalEvtHandler::OnPagingHandler));
