By default, the VirtualMode property is True. The VirtualMode property specifies whether the control is running in virtual mode. When the VirtualModex property is True, the thumbnails are generated for the files being visible only. When the VirtualMode property is False, the control loads in the background the thumbnails for all files. The AutoUpdate property indicates whether the control automatically updates the thumbnail's view being changed externally. Once the AutoUpdate property is True, the control automatically regenerates the thumbnails for files being changed in the current view.