Options in Select box displaying on top of menu
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I have a .Net application that is using the skmMenu control to manage the menu dropdowns.  Directly below the menu is a 'Select' box.  If you click on the select box the options pop up and stay displayed until you click off or select one.  While they are displayed, if you mouse over the menu the dropdown displays but gets partially hidden behind the select boxs' options.

I have the select box z-index set to -1 and the menu dropdowns to z-index set to 99.  I can't figure out what to do to get the menu to display on top of everything.

Appreciate any advice for this.