Use the Font property to change the font to display the control's caption. Use the Caption property to display a caption on the thumbnail control. 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 ForeColor property to specify the control's foreground color. Also, you can use the <font> HTML tag to display a portion of text using a different font.