I've managed to get the WinHelp working and can now read the TMS help files.
They have let me solve a few problems but i still can't set these two properties in a MegaMenu.
Fill.RoundingType := rtBoth; // Help shows rtBoth but the compiler doesn't like it
Fill.Glow := gmNone; // Help doesn't show a Glow property but from error messages I see there is Fill.Glow which is the glow mode.
I've tried lots of properties such as gmNone, gmNil, gtNone, glNone, but can't guess the syntax for glow mode none.
I've even tried Fill.Glow := gmNone.Please;