Any suggestions on this?
Well you didn't even bother to put the link (of the "blog entry you found") up for reference and got nothing for four days so I'd say then that's a "No".
Hi Christian Berg,
Here is the blog entry which shows data markers on the middle of vertical bar, but in 11g I couldn't figure out the file that i supposed to edit. debugging with firebug or inspect is not working on the graph markers.