checkAll
Selects or deselects all checkboxes in the group.
Parameters
select Boolean
Selects or deselects all checkboxes in the group.
Example
<ul id="checkboxgroup"></ul>
<script>
$("#checkboxgroup").kendoCheckBoxGroup({
items: [ "one", "two", "three" ]
});
var checkGroup = $("#checkboxgroup").getKendoCheckBoxGroup();
checkGroup.checkAll(true);
</script>