Display Thumbnails

The control will update on each paint, to reflect the current state of the thumbnails. When adding multiple thumbnails, it may be beneficial to disable painting to reduce redraw flicker. To disable paint, call BeginUpdate prior to loading any images. Then, load images and generate thumbnails. You can query the status of the thumbnail by calling GetItemStatus. When all thumbnails have been generated and are ready for display, call EndUpdate. Painting will resume, displaying all the generated thumbnails (or error icons, if generation failed).