如何使对话框居中显示\Demo\Demo.cpp
....................\....\Demo.dsp
....................\....\Demo.dsw
....................\....\Demo.h
....................\....\Demo.plg
....................\....\Demo.rc
....................\....\DemoDlg.cpp
....................\....\DemoDlg.h
....................\....\DemoDoc.cpp
....................\....\DemoDoc.h
....................\....\DemoView.cpp
....................\....\DemoView.h
....................\....\MainFrm.cpp
....................\....\MainFrm.h
....................\....\ReadMe.txt
....................\....\res\Demo.ico
....................\....\...\Demo.rc2
....................\....\...\DemoDoc.ico
....................\....\resource.h
....................\....\StdAfx.cpp
....................\....\StdAfx.h
....................\....\res
....................\Demo
如何使对话框居中显示