There is a problem updating DELPHI XE7 1 (see my QC report 129171 )
You can overcome this with this little code (example for MaxLength = 5):
procedure TForm1.Edit1Typing(Sender: TObject);
begin
if Length(Edit1.Text) > 5 then
Edit1.Text:= Edit1.Text.Substring(0, 5);
end;
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