EditCell
function EditCell(ACol, ARow: Integer; Key: WideChar): Boolean; overload; virtual;
function EditCell(Location: TPoint; Value: WideString = ''): Boolean; overload;
function EditCell(ACol, ARow: Integer; Key: WideChar): Boolean; overload; virtual;
function EditCell(Location: TPoint; Value: WideString = ''): Boolean; overload;