private void UpdateDo(DependencyPropertyChangedEventArgs dependencyPropertyChangedEventArgs)
        {
            var value = dependencyPropertyChangedEventArgs.NewValue;

            if (value != null)
            {
                AssuranceCompany.DataSource = value;
                ControlExt.SetDataSource(EntryDate, value);
                ControlExt.SetDataSource(LeavingDate, value);

                ControlExt.SetDataSource(Amount, value);
                ControlExt.SetDataSource(PolizaBox, value);
            }
        }