vb.net - Why does ASP.NET TreeView node expanding not work on postbacks? -


i populating asp.net (vb) treeview data database. while populating tree, programmatically expand specific nodes based on data. node expansion completed correctly when called non-postbacks not postbacks after button click. thinking page lifecycle resetting formatting somehow on button postbacks. know how can populate treeview nodes formatting intact button postbacks?

protected sub page_load(byval sender object, byval e system.eventargs) handles me.load    'formatting intact     if not page.ispostback       loadtreeview("mytree")     end if    'formatting not intact     if page.ispostback       loadtreeview("mytree")     end if   end sub  'formatting not intact public sub btnloadhierarchy_click(byval sender object, byval e system.eventargs) handles btnloadhierarchy.click   loadtreeview("mytree") end sub  <asp:button id="btnloadhierarchy" runat="server" text="load hierarchy"/>  <asp:treeview id="hierarchytree" runat="server"> </asp:treeview>


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