Custom Treeview control with multiple buttons

See more:

C#

ASP.NET

Javascript

C#4.0

i have a treeview control which binds all folders and files in my application like below

<asp:TreeView ID="tvFolders" runat="server">
                              <HoverNodeStyle Font-Underline="false" ForeColor="#5555DD" />
                              <NodeStyle Font-Names="Verdana" Font-Size="8pt" ForeColor="Black" HorizontalPadding="5px"
                                  ImageUrl="~/images/childfolder.png" NodeSpacing="0px" VerticalPadding="0px" />
                              <ParentNodeStyle Font-Bold="False" ImageUrl="~/images/childfolder.png" />
                              <SelectedNodeStyle Font-Underline="True" ForeColor="#5555DD" HorizontalPadding="0px"
                                  VerticalPadding="0px" />
                              <LeafNodeStyle />
                          </asp:TreeView>

i need two buttons at each leafnode as download,delete. if i click those buttons respective actions should done for respective node(file).
for this i have binded my treeview like below

foreach (string folder in Directory.GetDirectories(Server.MapPath("~/")))
            {
                string filename = Path.GetFileName(folder);
                if (filename.StartsWith("FY"))
                {
                    TreeNode tn = new TreeNode();
                    tn.Text = filename;
                    tn.Target = "_blank";
                    tvFolders.Nodes.Add(tn);

                    foreach (string innerfolder in Directory.GetDirectories(folder + "/"))
                    {
                        TreeNode intn = new TreeNode();
                        intn.Text = Path.GetFileName(innerfolder);
                        intn.Target = "_blank";
                        tn.ChildNodes.Add(intn);

                        DirectoryInfo directory = new DirectoryInfo(innerfolder);
                        FileInfo[] files = directory.GetFiles("*");

                        foreach (FileInfo file in files)
                        {
                            StringBuilder nodeText = new StringBuilder();
                            nodeText.Append(@"<table border="" 0="" cellpadding="" cellspacing=""><tr><td>");
                            nodeText.Append(@"<a style="" href="#" hold=" /&gt;                            nodeText.Append(@"> ").Append(file.Name).Append("</a>");
                            nodeText.Append(@"</td><td>");
                            nodeText.Append(@"</td><td>");
                            //nodeText.Append(@"&nbsp;&lt;input  önclick='return confirm('Are you sure want to delete this file?');' type='image' height='20px' height='20px'");
                            nodeText.Append(@"&nbsp;&nbsp;&nbsp;<a href="#">&lt;input id='filedownload' title='Download' type='image' height='10px' height='10px' src='images/download.png' /&gt;</a>&nbsp;&nbsp;");
                            nodeText.Append(@"&nbsp;<a href="#">&lt;input id='filedelete' type='image' title='Delete' height='10px' height='10px' ;' src='images/delete_node.png' /&gt;</a>");

                            nodeText.Append(@"</td></tr></table><a href="#">");
                            TreeNode file1 = new TreeNode();
                            //file1.Text = Path.GetFileName(file.Name);
                            file1.Text = nodeText.ToString();
                            file1.Value = "File";
                            file1.Target = "_blank";

                            if (file.Extension == ".doc" || file.Extension == ".docx")
                                file1.ImageUrl = "~/images/wordicon.png";
                            else if (file.Extension == ".pdf")
                                file1.ImageUrl = "~/images/pdficon.png";
                            else if (file.Extension == ".xls" || file.Extension == ".xlsx")
                                file1.ImageUrl = "~/images/excelicon.png";
                            else
                                file1.ImageUrl = "~/images/fileimg.png";

                            intn.ChildNodes.Add(file1);
                        }
                    }
                }
            }

so now i am getting two input buttons for each leaf node.

the problem is i m unable to get postback event for that leafnode click. i tryed to do in javascript __dopostback but my page is having update panel, it may be effecting not to postback.
i dont knw.

How to get leaf node click event in code behind.

i also tryd writing window.open(respective file path); in download button. it also not working

pls help.

thanks advance.