Determines whether to automatically check child nodes.
When this property is enabled, it should be used with
loadOnDemandset to 'false' (see example). Otherwise, after expand of a checked node (and load of its inner items) the value selected in the widget and the checked items in the drop-down will no longer be in sync. Currently, such scenario is not among the supported.
Specifies if on clicking the tree node, the item will be checked or unchecked, or if selection will be performed only on checkbox click.