Hi Pawan,
You can change the plus/minus image of the RadTreeView by assigning different css classes as described in the forum post below:
http://www.telerik.com/community/forums/aspnet-ajax/treeview/how-to-change-the-expand-and-collapse-icons.aspx#1741923
http://www.telerik.com/community/forums/aspnet-ajax/treeview/how-to-change-the-expand-and-collapse-icons.aspx#1743501
Greetings,
Kate
the Telerik team
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