property Highlight.Underline as Boolean
Underlines the text.

TypeDescription
Boolean A boolean expression that indicates whether the element's text is underlined.
By default, the Underline property is False. The Underline property indicates whether the element's text is underlined. You can use the Font property to change the element's font, including name, size, attributes and so on. You can use the FontSize property to display the element with the same font of a different size.   

The following screen shot displays the objects with this element set: