set a small window background procedure, the window is no longer a blank, embedded map

Packet : 69491740backgrouplistbox.rar filelist
BackGroupListBox\BackGroup.jpg
BackGroupListBox\BackGroupListBox.aps
BackGroupListBox\BackGroupListBox.cpp
BackGroupListBox\BackGroupListBox.h
BackGroupListBox\BackGroupListBox.ncb
BackGroupListBox\BackGroupListBox.rc
BackGroupListBox\BackGroupListBox.sln
BackGroupListBox\BackGroupListBox.suo
BackGroupListBox\BackGroupListBox.vcproj
BackGroupListBox\BackGroupListBoxDlg.cpp
BackGroupListBox\BackGroupListBoxDlg.h
BackGroupListBox\bg.bmp
BackGroupListBox\Debug
BackGroupListBox\MyListBox.cpp
BackGroupListBox\MyListBox.h
BackGroupListBox\MyListBoxApp.cpp
BackGroupListBox\MyListBoxApp.h
BackGroupListBox\ReadMe.txt
BackGroupListBox\res\BackGroupListBox.ico
BackGroupListBox\res\BackGroupListBox.manifest
BackGroupListBox\res\BackGroupListBox.rc2
BackGroupListBox\res
BackGroupListBox\resource.h
BackGroupListBox\stdafx.cpp
BackGroupListBox\stdafx.h
BackGroupListBox

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