I was trying to do exactly the same thing and I came across this same problem.
I had a two-column setup with multiple rows built in Cornerstone. I made a navigation menu with Cornerstone on the right-hand side in the first row.
After reading this thread it gave me the idea to play around with some z-index values. Increasing the z-index value of the menu made no difference. What worked for me was setting z-index:0 for every row after the first.
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This reply was modified 7 years, 7 months ago by Sam Rae.
