vc++ drag to move the rectangle position

ImagePreviewWnd
...............\ImagePreviewWnd
...............\...............\ImagePreviewWnd.aps
...............\...............\ImagePreviewWnd.cpp
...............\...............\ImagePreviewWnd.h
...............\...............\ImagePreviewWnd.rc
...............\...............\ImagePreviewWnd.vcxproj
...............\...............\ImagePreviewWnd.vcxproj.filters
...............\...............\ImagePreviewWnd.vcxproj.user
...............\...............\ImagePreviewWndDlg.cpp
...............\...............\ImagePreviewWndDlg.h
...............\...............\ReadMe.txt
...............\...............\res
...............\...............\...\ImagePreviewWnd.ico
...............\...............\...\ImagePreviewWnd.rc2
...............\...............\resource.h
...............\...............\Slipper.cpp
...............\...............\Slipper.h
...............\...............\stdafx.cpp
...............\...............\stdafx.h
...............\...............\targetver.h
...............\...............\tree.jpg
...............\ImagePreviewWnd.sln
...............\ImagePreviewWnd.suo

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