TX Text Control .NET for Windows Forms Reference GuideTXTextControl Namespace SubTextPart Class HighlightColor Property
Gets or sets the highlight color for the subtextpart. A subtextpart is highlighted, if it contains the current text input position. The color's alpha value must be less than 255 (opaque) so that the textpart's text remains visible. The default value is red with an alpha value of 60.
public System.Drawing.Color HighlightColor { get; set; }Public Property HighlightColor() As System.Drawing.Color