The First Step in Setting up the tree control is defining of the key of a child entity (Categories), Connected to itself (the same entity) as Parent entity.
1. Determine the Entity containing the Tree
It refers to an entity attributed to the tree control Form.
2. Assign list Keys
These two keys connect two entities with Assign list and with Tree.
3. Tree Entity Key
This key is related to the same entity. It is required for the Tree form control.
It created the object of the same type with the relation: Child-Parent
4. Save an Entity
After completing the steps above, Select the save button to save the changes.