treeview in close after the click subchild node link

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ASP.NET

ASP.NET4

hi i am useing in tree view control

and create a parent, child node and subchild node,
fist time only show parent node then i click parent it show child then i click it show the sub child node but when i click subchild and the page is open the tree view control is close and show only parent node but i need its show when it is show in subchild page open time.

i hope you are getting my point,