TUnimEdit - Enabled = false doesn't execute

[Int3g3r]

Hello,

Follow example:

// Delphi/Pascal Syntax
procedure TfrmHandel.edtScanChange(Sender: TObject);
begin
    if Length(edtScan.Text) = 16 then
    begin
      edtScan.Enabled := false;
      doStuff; // it can take 10 seconds to finish (apiRequest)
      edtScan.Clear;
      btnCancel.SetFocus;
      edtScan.Enabled := true;
    end;
end;

The disabling / enabling of the edtScan (TUnimEdit) doesn't happen in the browser.
The User should not be allowed to enter text while "doStuff" is not finished, so i would like to disable the element until it's done.

How can i archive this behavior ?

Regards,
Int3g3r