14.如何设置应用程序窗口的背景颜色？\MainFrm.cpp
...................................\MainFrm.h
...................................\ReadMe.txt
...................................\..lease\Test.exe
...................................\res\Test.ico
...................................\...\Test.manifest
...................................\...\Test.rc2
...................................\...\TestDoc.ico
...................................\...\Toolbar.bmp
...................................\Resource.h
...................................\stdafx.cpp
...................................\stdafx.h
...................................\Test.cpp
...................................\Test.h
...................................\Test.ncb
...................................\Test.rc
...................................\Test.sln
...................................\Test.suo
...................................\Test.vcproj
...................................\TestDoc.cpp
...................................\TestDoc.h
...................................\TestView.cpp
...................................\TestView.h
...................................\Release
...................................\res
14.如何设置应用程序窗口的背景颜色？