这个例子演示了如何向一个TreeView控件增加、减少结点

增加结点的方式包括了增加“兄弟姐妹”结点：这种情况也四种增加方式，分别

是最初、最后、下一个和上一个。也包含了增加子结点的方式

这样就使用了TreeView控件中的这5种关系。

另外，该例子也演示例如何通过拖放操作来对结点进行位置上的改变

拖放操作是比较广泛的一种Windows操作，在本例子之后将对其进行介绍

-This example demonstrated how a TreeView control to increase, decrease node increase nodes in the form of an increase in the "brothers and sisters" Guitar : This also means an increase of four, is the first, last, and the next one on one. The increase also includes sub-nodes in the form of the TreeView on the use of controls, which are the five kinds of relations. Moreover, the examples also demonstrate how the cases drag and drop nodes to the right for a change of location of drag-and-drop operation is a broad Windows operation, in this case after its introduction