using overflow-y: auto for a long submenu, submenu closes when using scrollbar

[drasticplastic 0]

anyone have any recommendations? using overflow-y: auto for a long submenu, submenu closes when using scrollbar. trying to keep this all in CSS…

 

.SubMenu.MenuLevel1 {max-height: 300px;overflow-y: auto;overflow-x: hidden;margin:0px;padding:0px;border:0px;}