[junhsiehParticipant]

This works for me (I am using the bootstrap theme):

$('#CompNameInput').on('open', function (event) {
          $('.jqx-menu-vertical-bootstrap').css({
            'max-height': '300px',
            'overflow-y': 'auto',
            'overflow-x': 'hidden',
          });
        });

[Author]

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