/// <summary>
 ///
 /// </summary>
 /// <param name="item"></param>
 public void AddItem(string item)
 {
     if (!string.IsNullOrWhiteSpace(item))
     {
         ItemsListbox.Items.Add(item);
         ItemsListbox.ScrollIntoView(item);
     }
 }
 /// <summary>
 ///
 /// </summary>
 /// <param name="key"></param>
 /// <param name="value"></param>
 public void AddItem(string key, string value)
 {
     if (!string.IsNullOrWhiteSpace(key) && !string.IsNullOrWhiteSpace(value))
     {
         bool itemFound = false;
         foreach (PairValue item in ItemsListbox.Items)
         {
             if (item.Key.Equals(key))
             {
                 item.Value = value;
                 itemFound  = true;
                 break;
             }
         }
         if (!itemFound)
         {
             PairValue item = new PairValue(key, value);
             ItemsListbox.Items.Add(item);
             ItemsListbox.ScrollIntoView(item);
         }
     }
 }