private static void MoveNextCommand_CanExecute(object sender, CanExecuteRoutedEventArgs e)
        {
            RecordNavigator navigator = sender as RecordNavigator;

            if (navigator != null && navigator._lstItems != null && navigator._lstItems.Items.Count > 0)
            {
                e.CanExecute = navigator._lstItems.Items.CurrentPosition < navigator._lstItems.Items.Count - 1;
            }
        }
        private static void MoveNextCommand_Executed(object sender, ExecutedRoutedEventArgs e)
        {
            RecordNavigator navigator = sender as RecordNavigator;

            if (navigator != null && navigator._lstItems != null && navigator._lstItems.Items.Count > 0)
            {
                navigator._lstItems.Items.MoveCurrentToNext();
            }
        }