There is nothing wrong with this code. What error message are you getting?
Does the error occur at compile time or at run time?

--
Bill Todd (TeamB)
(Questions received via email cannot be answered.)

I want to associate the OnChange Event of a Field (say, 'MName') in a Table,
to a procedure that I defined, at runtime. However, I found that I cannot
correctly associate the two as expected.
But it is possible when I have the field 'MName' added in the Field Editor
of the Table (I have tried this at design time).  I guess that may be as I
used the code below:

MyTable.FieldByName('MName').OnChange := MyTableFieldChange;

but the compiler cannot locate the TField object that is named 'MName'? I
have used de{*word*81} to inspect the value of "MyTable.FieldByName('MName')"
and found that it is inaccessible.

So, how can I add a field to Field Editor (of a Table) at runtime? Or any
other suggestions on solving this problem? By the way, I used
ApolloDatabase, ApolloTable, does it make any difference?

It does not cause any error message, I just cannot get the method (that is
associated with the OnChange event) called when the Field has changed.

Just to say that I have found the core problem (and is solved). I actually
have associated the event handler successfully. Their connection is,
however, lost when I set the Active property of the TTable object from false
to true.

Yes. TTable recreates the field objects each time it is opened so you will
have to reconnect the event handler when you open the TTable.

--
Bill Todd (TeamB)
(Questions received via email cannot be answered.)