In the upcoming 8.3.0, you can use the OnIncludeLayer event:
// Exclude masks from view
function TMyForm.IELayerMView1IncludeLayer(Sender: TObject; LayerIndex: integer; Layer: TIELayer; var Include: Boolean);
begin
if Layer.IsMask = False then
Include := False;
end;
Nigel
Xequte Software
www.imageen.com