access violation while selecting positions from DBComboBox

[ensim]

Hi,
I've problem selecting positions from DBComboBox (positions are added by mysql SELECT).

If i'll use mouse to click and select positions I got error 'access violation', but if i'll use keyboard arrows [up and down] everything works fine ...

any ideas?

CODE:
procedure TForm1.Button1Click(Sender: TObject);
begin
  Form1.MySQL50Connection1.Open;
  if Form1.MySQL50Connection1.Connected = True then
     begin
     Form1.SQLQuery1.SQL.Text := 'SELECT * FROM ensim WHERE 1';
     Form1.SQLQuery1.Open;
     while not SQLQuery1.EOF do begin
     Form1.DBComboBox1.Items.Add(SQLQuery1.Fields[0].asString);
     Form1.Label2.Caption := SQLQuery1.Fields[0].asString;
     Form1.DBComboBox1.Text := SQLQuery1.Fields[0].asstring;
     SQLQuery1.Next;
     end;
     Form1.Button1.Enabled := False;
     end
  else
     begin
          Form1.DBComboBox1.Items.Add('Nie można polaczyc');
     end
 
end;

[Almindor]

Which widgetset? AFAIK gtk2 has dbcombobox broken atm.

[ensim]

I'm compiling under windows.

btw. if i wont click the button which gets data from SQL and puts it into combobox application is closing without any errors.