hidden & wait cmd ffmpeg thumbnail + fixes

* wait - http://support.microsoft.com/kb/305369
* hidden -
http://social.msdn.microsoft.com/Forums/en-US/Vsexpressvcs/thread/0d0af0aa-84e9-488d-b49e-af99206f4bcf
* wMain - re load after adding
* Domain.Patient dint initialise IList<Domain.Visit> Visits

Pending:
* MTags
* cleanup