/* CSS for multi-column ListBox (note: FlexBox is not supported by IE9) */
.multi-column.wj-listbox, /* direct children, like ComboBox */
.multi-column .wj-listbox { /* grand children, like MultiSelect */
    display: flex;
    flex-wrap: wrap;
    max-width: 430px;
}
    .multi-column .wj-listbox-item {
        min-width: 140px;
    }
