Hi,
sorry for long response time.
I've uploaded a new version with following css:
.dijitSelectMenu.dijitSelectCheckbox {
overflow-y: auto !important;
}
You can add a new rule in your css that will constrain height of menu to a specified size, e.g.
.dijitSelectMenu.dijitSelectCheckbox {
max-height: 100px;
}
Best Regards,
Mariusz