add and delete column at runtime

[fcodebue]

I create my vt at runtime with these istructions

vt_maga_tvg.AddField('FIELD01', ftString, 20);
vt_maga_tvg.AddField('FIELD02', ftFloat, 0);

when I press a button (change view button) I want to clear grid connected to the vt and vt itself.
So I do:

vt_maga_tvg.DeleteFields;
vt_maga_tvg.Refresh;

and I add other fields

vt_maga_tvg.AddField('FIELD04', ftString, 20);
vt_maga_tvg.AddField('FIELD05', ftFloat, 0);


this does'nt create any problem, but if I add a field with a name of a field already create ( and deleted)

vt_maga_tvg.AddField('FIELD02', ftString, 20);

vt raise an error

[Plash]

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