procedure TfrmMain.Button1Click(Sender: TObject);
begin
JvThumbView1.Directory := '';
// Section 1, does nothing
JvThumbView1.AddFromFile('D:\app_vlt\pdf\1\0000A6FA-A1AB-46C7-8083-A1F8C38B9EFA.jpg');
JvThumbView1.AddFromFile('D:\app_vlt\pdf\1\0000C794-F7DC-4EC9-BC47-C22741505B71.jpg');
JvThumbView1.AddFromFile('D:\app_vlt\pdf\1\000021A1-D6B1-4EE0-8A7A-BED429A6C8E8.jpg');
Exit; // <-- Comment out sections and move this exit, so that only the one or two sections you want are "live" at a time
// Section 2, adds thumbnails "panels" but no image is shown in any of them
JvThumbView1.AddThumb('My First Thumb', True);
JvThumbView1.AddThumb('My Second Thumb', True);
JvThumbView1.AddThumb('My Third Thumb', True);
// Section 3, (Combine with Section 2 above) thumbmain panels created in Section 2 above are shown, but no images
JvThumbView1.ThumbList[0].FileName := 'D:\app_vlt\pdf\1\0000A6FA-A1AB-46C7-8083-A1F8C38B9EFA.jpg';
JvThumbView1.ThumbList[1].FileName := 'D:\app_vlt\pdf\1\0000C794-F7DC-4EC9-BC47-C22741505B71.jpg';
JvThumbView1.ThumbList[2].FileName := 'D:\app_vlt\pdf\1\000021A1-D6B1-4EE0-8A7A-BED429A6C8E8.jpg';
end;