If the 'CascadeState property is set to non-zero, the system automatically cascades parent states to their children and correspondingly makes parent states representative of all of their children. Setting a parent state, either under program control or using the 'AutoState property in the Treeview definition, will result in all subordinate children being set to the same state.

When a child state is set, its parent state will be set according to the state of all of the child's siblings; i.e., if all children are in a consistent state, the parent will be set to the same state. If a parent has children of various states (some on, some off), the parents state will be set to the value set in the 'CascadeState property.

See State Indicators.