constants BackModeEnum
Specifies the background mode when painting the selected items. The SelBackMode property retrieves or sets a value that indicates whether the selection is transparent or opaque.

NameValueDescription
exOpaque0 The selection is opaque.
exTransparent1 The selection is transparent.
exGrid2 The selection is half transparent half opaque 
exCustom3 User is responsible for painting the selected items.