说明：  As I was looking for a more advanced tree control, I came across the article Tree Editor by Yossi Patt. The tree control in this article seemed to have most of the features I had need for. Unfortunately this tree control was nearly unusable outside its demo application. I tried to adapt the tree control to suit my needs, but gave up after one day. It would take too much effort for me to get it to work. In lack of an alternative, I decided to create my own full featured tree control. This class should be as independent as possible to get it work in many projects.
(As I was looking for a more advanced tree con trol. I came across the article by Yossi Tree Editor Pa tt. The tree control in this article seemed to ha 've most of the features I had need for. Unfortuna tely this tree control was nearly unusable outs ide its demo application. I tried to adapt the tr ee control to suit my needs. but gave up after one day. It would take too much e ffort for me to get it to work. In lack of an altern elector, I decided to create my own full featured tree con trol. This class should be as independent as pos sible to get it work in many projects.)