This .NET enum is a wrapper for AcGiHighlightStyle

Public Enum HighlightStyle
  None
  Custom
  DashedAndThicken
  Dim
  ThickDim
  Glow
End Enum

public enum HighlightStyle {
  None,
  Custom,
  DashedAndThicken,
  Dim,
  ThickDim,
  Glow
}