Slide.GetThumbnail has a box before each object

I have attached an example solution for you to see what I mean. When you run my program you will see the image of the slide on the form and you would see a small square appearing in front of the text box with the text "Account Name". The text box is not created using the Powerpoint program but problematically creating using the PPOM using vb.net. This happens to any object that we create.

Let me know if I am not clear enough.

Thanks,
Ronney