Prevent time scroll up beyond Start Time

In Day and Week view, our start time is 8:00 am. But user is able to scroll the time up all the way to midnight. This is not desirable for us. Is there a way to prevent user to scroll pass 8:00 am ?
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http://archive.seedcode.com/support/viewtopic.php?f=25&t=3951
Max ( Self ; Time ( 8 ; 0 ; 0 ) )