css - jqueryui menu's submenu -- how to keep in front -

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i'm using jqueryui's menu feature, , submenu overlaps other elements on page. problem when select menu item brings submenu, submenu displayed beneath other elements.

i'm not sure how menu configured, or if have override jqueryui css elements, in order display expected (over top of other page elements).

the problem can seen tools menu @ http://jsbin.com/hexuw/2/

sorry code more complex necessary show minimal problem, menu call can seen few lines down in javascript file.

thinking stacking problem tried setting navigation element z-index high number using .ontop class, didn't help.

add line z-index:9999; under selector .ui-menu

the css code be

/* put navigation left (jquery ui) */ .ui-menu {     width: 10%;     float: left;     z-index:9999; }

js bin live demo


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