Picture viewer won't show all pictures in a folder

When I double click on a picture file in a folder with many pictures dopus viewer opens up and I have the option to browse through the rest of the pictures from that folder.

If I just select one picture file and click on a viewer toolbar button then I can view only that one picture and not the rest and that is not usefull specially if u have jpg files associated with other app so double click don't open in dopus viewer.