Unfortunately, the Delphi environment has some auto completion issues. Properties with arguments such as the table classes in Chameleon, appear to stop auto-completion from working. This piece of code illustrates the problem:

   // Auto completion works here. 
   Msg.
   // But not here.
   Msg.Patient[0].

A trick to work around this problem is to assign a row class to the row you are trying to work with:

var
   PatientRow : THL7TblPatientRow;
begin
   PatientRow := Msg.Patient[0];
  
   // Auto completion will now work on the row object.
   PatientRow.

This bug still appears to be present in Borland Delphi 7 at the time this documentation was written.