Hi,
I am a bit further forward. I can 'fudge' this by adding the following css
.lotusui .dijitMenu{
border-top: 2px solid !important !ms;
border-bottom: 2px solid !important !ms;
}
This shows a top/bottom border of 2px where the menu does NOT go over the iframe, and a top/bottom border of 1px when it does go over the iframe. But, this does not explain where the standard top/bottom border of 1px goes. Any suggestions?