You mean you don't see image of workflow process as in background of this picture?
http://community.jboss.org/servlet/JiveServlet/downloadImage/38-3649-11584/450-282/ScreenHunter_04+Feb.+27+09.21.gif
Do you get any error? What does it mean you cannot open? Do you see only raw XML?
You should definetely provide more information if you want any advice?