[galaxy-dev] Display data in browser

Hello list, I'm currently trying to create a new tool, which has an .xhtml file as its output. After finishing the job, I would like to be able to click on the "eye icon" aka "Display data in browser" and display the resulting .xhtml file in the frame to the left of my tool history. Unfortunately I have no idea yet how I could accomplish this. Any help is highly appreciated. Best regards, Gromobir