This sample explains you about the CheckBox functionalities of the Dropdown Tree. Click on any parent item's CheckBox to check or uncheck the item and its child items. The parent item's checked state will be determined by its child item’s checked state.
The Dropdown Tree control can be rendered with the checkbox on the left side of each tree item. This allows the user to check more than one item, and this can be enabled by the showCheckBox property. In this demo, the Dropdown Tree is populated with the checkbox enabled feature.