办公系统简单后台模板，深蓝色风格，带登录页面及后台操作页面，操作页以选项卡形式打开，操作还是挺简单的-Office systems simple background template, dark blue style with login page and background operation page, operating page open in the form of a tab, the operation was quite simple.

Menggunakan page control, tab sheet, and message dialog