TreeView:

```
   -MainNode
      -node0
          data01
          -data02
             data021
             data022
          data03
      -node1
          data11
      -node2
          data21

```

Event SelectedChange;

As the choice of a node containing child nodes to get the final data?

For example:
selected node node0 receive data (data01, data021, data022, data03)