By default, the Alignment property is exAlignMiddleCenter. Use the Alignment property to align the caption in the thumbnail. Use the Caption property to display a HTML caption in the thumbnail. The SingleCaption property indicates the expression to generate the HTML caption to be displayed on the thumbnail, when the control shows a single thumbnail ( for instance you filter and you got a single result ). Use the Borders property to specify the size of the margins where the thumbnail picture is displayed.