Defines the constants that specify how nodes should be filtered in MultiColumnTreeView.
public enum FilterLevel
Filtering will be applied on root nodes initially, if root nodes matches the filter criteria, it will be displayed in View. After the root node passes in filter criteria, then child nodes will be filtered and so on.
If a child node matches the filter condition, all its parent nodes will also be displayed, even though parent node not matches with the filter condition.
Filtering will be applied only for root nodes.