private void ChangeSize()
 {
     if (ItemsListView.Items.Count < 10)
     {
         Height = DEFAULT_HEIGHT;
     }
     else
     {
         Rectangle rect = ItemsListView.GetItemRect(ItemsListView.Items.Count - 1);
         Height = ItemsListView.Items.Count * rect.Height + HEADER_HEIGHT + BottomPanel.Height;
     }
 }