using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using Telerik.Windows.Data;
using Telerik.Windows.Controls;
using Telerik.Windows.Controls.GridView;

namespace RadGridView_WPF_AR_92
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void TextBox_TextChanged(object sender, TextChangedEventArgs e)
        {      
            var change = e.Changes.First();
            if (e.Changes.First().AddedLength == 1 && ((sender as TextBox).Text[change.Offset] == 'l' || (sender as TextBox).Text[change.Offset] == 'L'))
            {
                (sender as TextBox).Text = (sender as TextBox).Text.Substring(0, e.Changes.First().Offset) + "12345" + (sender as TextBox).Text.Substring(change.Offset + 1, (sender as TextBox).Text.Length - 1 - change.Offset);
            }
        }
    }
}
