MFC文本框提示功能

MFC文本框原生態支持提示功能，即文本框提示輸入用戶賬戶，當獲取焦點時，則不顯示。

::SendMessageA((m_clSelTraderIDEdit.GetSafeHwnd()), CB_SETCUEBANNER, 0, (LPARAM)(L"請輸入交易賬號"));
::SendMessageA((m_clTraderPwdEdit.GetSafeHwnd()), EM_SETCUEBANNER, 0, (LPARAM)(L"請輸入交易密碼"));
::SendMessageA((m_clDynamicPwdEdit.GetSafeHwnd()), EM_SETCUEBANNER, 0, (LPARAM)(L"請輸入動態口令"));