SetBounds(x, y, Width, Height)
x: 窗口水平位置y: 窗口垂直位置Width: 窗口宽度Height: 窗口高度
http://www.foxtable.com/bbs/dispbbs.asp?BoardID=2&ID=66548&replyID=&skin=0
x =( ScreenWidth - Width) /2
y = (ScreenHeight - Height) /2