http://www.zwsoft.com/forum/viewthread.php?tid=2318 it is possible to add the command in ZWCAD zoomwhell it is a command that exists in later versions of Autocad and is especially useful for Mac users who also have to use Windows, because it allows the central wheel mouse is working so identical on Mac and Windows. Thanks nieble 2012-07-19 00:35:04 http://www.zwsoft.com/forum/viewthread.php?tid=2318&pid=15493 thanks for the suggestion, we will consider about it in future version huangy8949 2012-07-19 14:56:49