Thumbnail.Borders Property (ExThumbnail)

By default, the Borders property is "4 4 4 4". Use the Alignment property to specify the caption being displayed on the thumbnail control. Use the Transparency property to specify the percent of transparency being used to paint the caption on the thumbnail. Use the Appearance property to specify whether the thumbnail displays a border.

You can use the following properties to define the distance and padding of the thumbnails

The Borders property indicates the margins where the thumbnail is displayed, relative to the control's border.
The Margins property specifies the distance between thumbnails, when multiple thumbnails are displayed on the control.
The Padding property generates space around thumbnail. Clears the area around the content (inside the border) of the thumbnail.

		Type	Description
		String	A String expression that specifies a list of size for margins where the thumbnail picture is displayed. The first number indicates the size of the left margin, the second number indicates the size of the top margin, the third number indicates the size of the right margin, and the last number indicates the size of the bottom margin. All these numbers indicate pixels. The list is separated by space characters.