As Microsoft Office in it, in your application add " floating" of the combo box

FlatCombo
.........\demo_flat_combobox
.........\..................\FlatCombo.clw
.........\..................\FlatCombo.cpp
.........\..................\FlatCombo.dsp
.........\..................\FlatCombo.dsw
.........\..................\FlatCombo.h
.........\..................\FlatCombo.rc
.........\..................\FlatComboBox.cpp
.........\..................\FlatComboBox.h
.........\..................\FlatComboDlg.cpp
.........\..................\FlatComboDlg.h
.........\..................\ReadMe.txt
.........\..................\Release
.........\..................\res

.........\..................\...\FlatCombo.rc2
.........\..................\...\vssver.scc
.........\..................\resource.h
.........\..................\StdAfx.cpp
.........\..................\StdAfx.h
.........\FlatCombo
.........\.........\Release
.........\.........\res

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