Hello,
My application needs to use TreeView (or something like that, once the 
appearance matchs tree, it is ok) as navigation control, whose TreeNode is 
neither single text nor single navigation link, but a composite of dynamic 
text and link. The link must could be attached by 
ModalPopupExtender#TargetControlID because a modal popup is expected when 
clicking the link. Plz tell me how to implement it, or is there any 
microsoft control could meet my requirement.

Great thanks

zlf