Setting up custom viewer in Social Secure Visual Collaboration framework

I want to plug-in my viewer in ARAS. while trying to get it done. I followed these steps. but unfortunately no icon is visible to view Image in my customised viewer. a.       Created custom viewer with new name ( <AbhayViewer>). b.      Configured filetype png having “view with” relationship with above customviewer. c.       Copied all files with ( similar to) ImageViewer in respective folders. d.      It did not activate Viewer tab in ARAS session. e.       Setup few debug points in different javascripts files. Any document to understand the approach to plugin new viewer will be helpful. thanks.