PaintBackground Event (RasterThumbnailBrowser)

using Leadtools.WinForms; 
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Drawing; 
 
class MyForm1 : Form 
{ 
   public RasterImageList imageList; 
   public MyForm1(string title) 
   { 
      Text = title; 
 
      // Set the size of the form 
      Size = new Size(400, 200); 
 
      // Create a new RasterImageList control. 
      imageList = new RasterImageList(); 
      imageList.Bounds = new Rectangle(new Point(0, 0), Size); 
 
      imageList.Sorting = SortOrder.Ascending; 
      imageList.BorderStyle = BorderStyle.None; 
      imageList.DoubleBuffer = true; 
      imageList.Dock = DockStyle.Fill; 
      RasterPaintProperties paintProperties = imageList.PaintProperties; 
      paintProperties.PaintDisplayMode = RasterPaintDisplayModeFlags.Bicubic; 
      imageList.PaintProperties = paintProperties; 
      imageList.EnableKeyboard = true; 
      imageList.UseDpi = true; 
 
      // Add a handler to the PaintBackground event 
      imageList.PaintBackground += new PaintEventHandler(rasterImageList_PaintBackground); 
 
      RasterCodecs codecs = new RasterCodecs(); 
 
      // Create three items 
      string imagesPath = LEAD_VARS.ImagesDir; 
 
      for (int i = 0; i < 3; i++) 
      { 
         // Load the image 
         int index = i + 1; 
         string imageFileName = Path.Combine(imagesPath, @"ImageProcessingDemo\Image" + index.ToString() + ".cmp"); 
         RasterImage image = codecs.Load(imageFileName, 0, CodecsLoadByteOrder.BgrOrGray, 1, 1); 
         RasterImageListItem item = new RasterImageListItem(image, 1, "Item" + index.ToString()); 
 
         // Select the first item 
         if (i == 0) 
            item.Selected = true; 
 
         // Add the item to the image list 
         imageList.Items.Add(item); 
      } 
 
      // Add the RasterImageList to the control collection. 
      Controls.Add(imageList); 
   } 
 
 
   private void rasterImageList_PaintBackground(object sender, PaintEventArgs e) 
   { 
      // Get the image list control 
      RasterImageList imageList = sender as RasterImageList; 
 
      // Fill the background with a gradient brush 
      Rectangle rc = imageList.ClientRectangle; 
 
      Brush b = new LinearGradientBrush( 
         rc, 
         Color.Bisque, 
         Color.White, 
         LinearGradientMode.Vertical); 
      e.Graphics.FillRectangle(b, rc); 
      b.Dispose(); 
   } 
 
} 
 
public void RasterImageList_RasterImageList(string title) 
{ 
   MyForm1 form = new MyForm1(title); 
   form.ShowDialog(); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images"; 
}