Q: How can I show thumbnail images at the beginning of showing pages?

I see there is a "Thumbnail" button on the toolbar, how can I show the thumbnail images while opening the flash book?

A: While creating flash books, you are enabled to show page thumbnails at the very beginning of opening your flash eBook, just set "Thumbnails->Initial Show->Thumbnails".
You can also set the thumbnail panel color in "Thumbnails->Thumbnails Background Color".