MFC程序，从Cwnd派生，自绘CTabCtrl， 可以任意设置颜色，字体，Tab标签位置，动态切换字体，背景色，标签大小和位置，动态添加、删除Tab标签。(MFC program, derived from Cwnd, drawn from CTabCtrl, you can set the color, font, Tab tag position, dynamic switching font, background color, label size and location, dyna