3 name: event-tree-select
6 Triggered when a tree node is selected or deselected.
8 If a node is selected, then **event.node** contains the selected node.
10 If a node is deselected, then the **event.node** property is null.
18 var node = event.node;
23 // a node was deselected
24 // e.previous_node contains the deselected node