Thanks. Actually the problem is into the code of the demo file. I forgot to update the $.getAbsoluteIndex to $.jgrid.getAbsoluteIndex (since of namespace conflict with other plugins). Now evrething work fine in all IE
yes, it is working in the demo now. Please don't forget to correct the example code as well.
In my own project it is not working with your solution, but I used a different way to attach the content menu to the grid, I followed the approach which was published in the integration section in spanish, where the context menu is attached in the afterInserRow event.
If I leave out the MSIE specific code it works in my project.