>>>>>Wei,
>>>>>
>>>>>Check Thread #1061022
>>>>
>>>>Hugo, Thank you very much.
>>>
>>>You are welcome
>>
>>Well, I have additional problem with using MouseUp. It doesn't fire when right click on the node. If right clicking outside the node, the fucos (highlight) goes to the node closest to the clicking point while the selected node is kept unchanged. I want to have a right click popup menu for the operation against the selected node. Right mouse clicking will move the highlight off the selected node. How can I solve this problem?
>
>Ah, I see you are using the MouseUp alternative, I can not help you there for I do not use it that way, I use the alternative I posted in Message #1061136 of that thread. Did you try it?

Oh, I just picked up the first one. I should use your approach in my case. Thanks a lot.