Name of the source field, that indicates if the checkbox is checked.
Examples
Custom Name
<div id="tree"></div>
<script>
var tree = $('#tree').tree({
checkboxes: true,
checkedField: 'checkedFieldName',
dataSource: [ { text: 'foo', checkedFieldName: false, children: [ { text: 'bar', checkedFieldName: true }, { text: 'bar2', checkedFieldName: false } ] }, { text: 'foo2', children: [ { text: 'bar2' } ] } ]
});
</script>