From Jeremie Leroy - XOJO Controls Wiki
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Property (As Boolean)
aThumbViewer.AutoSize = newValue
BooleanValue = aThumbViewer.AutoSize

If the ThumbViewer is a HorizontalViewer and ThumbHeight + 2*ThumbSpacing is greater than the Height of the ThumbViewer, the ThumbNails will be resized to correctly fit. For Vertical ThumbViewer if the width is smaller than ThumbWidth + 2*ThumbSpacing, the Width of the Thumbnails will be resized.