Dynamic nested Controls in asp.net after user action

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C#

ASP.NET

HTML

I am trying to make a web page that loads image buttons and other controls, where these buttons leads to another image buttons and other controls that have event handlers that do the same for illustration:

1- When the page loads i need to view all parent folders as image buttons using database:

protected void popAllParent()
    {
        Reporting repo = new Reporting();
        foreach (Reporting item in repo.getAllFolders())
        {
            Label labelFold = new Label();
            CheckBox chb = new CheckBox();
            RadioButton rad = new RadioButton();
            ImageButton imgBtn = new ImageButton();

                labelFold.Text = " " + item.FolderName;
                labelFold.Attributes.Add("pfolderID", item.FoldID);

                chb.Attributes.Add("pfolderID", item.FoldID);

                rad.Attributes.Add("pfolderID", item.FoldID);
                rad.GroupName = "foldDelete";

                imgBtn.ImageUrl = "~/Style/images/folder.png";
                imgBtn.ID = "imgPfold" + item.FoldID;
                imgBtn.Attributes.Add("pfolderID", item.FoldID);
                imgBtn.Width = 50;
                imgBtn.Height = 50;
                imgBtn.Click += new ImageClickEventHandler(ImageButton1_Click);

                Panel1.Controls.Add(labelFold);
                Panel1.Controls.Add(new LiteralControl("  "));
                Panel1.Controls.Add(chb);
                Panel1.Controls.Add(new LiteralControl(" "));
                Panel1.Controls.Add(rad);
                Panel1.Controls.Add(new LiteralControl("<br />"));
                Panel1.Controls.Add(imgBtn);
                Panel1.Controls.Add(new LiteralControl("<br />"));
            }

        }

2- for each img button there is an event handler leads to subfolders method:

    protected void ImageButton1_Click(object sender, ImageClickEventArgs e)
    {
        ImageButton ibtn = (ImageButton)sender;
        ViewState["Sample"] = ibtn.Attributes["pfolderID"].ToString();
        popAllSub(ibtn.Attributes["pfolderID"].ToString());
    }

    protected void popAllSub(string pfID)
    {
        Reporting repo = new Reporting();

        Panel1.Controls.Clear();

        foreach (Reporting item in repo.getAllSubFolders(pfID))
        {
            Label labelFold = new Label();
            CheckBox chb = new CheckBox();
            RadioButton rad = new RadioButton();
            ImageButton imgBtn = new ImageButton();

            labelFold.Text = " " + item.FolderName;
            labelFold.Attributes.Add("pfolderID", item.FoldID);

            chb.Attributes.Add("pfolderID", item.FoldID);


            rad.Attributes.Add("pfolderID", item.FoldID);
            rad.GroupName = "foldDelete";

            imgBtn.ImageUrl = "~/Style/images/folder.png";
            imgBtn.Attributes.Add("pfolderID", item.FoldID);
            imgBtn.ID = "imgSfold" + item.FoldID;
            imgBtn.Width = 35;
            imgBtn.Height = 35;
            imgBtn.Click += new ImageClickEventHandler(ImageButton1_Click);

            Panel2.Controls.Add(labelFold);
            Panel2.Controls.Add(new LiteralControl("  "));
            Panel2.Controls.Add(chb);
            Panel2.Controls.Add(new LiteralControl(" "));
            Panel2.Controls.Add(rad);
            Panel2.Controls.Add(new LiteralControl("<br />"));
            Panel2.Controls.Add(imgBtn);
            Panel2.Controls.Add(new LiteralControl("<br />"));
        }
}

3- Folders in db is like this:

fName        fID     fType     parentID
---------------------------------------
Quality       3      Child     1
Summary       1      Parent 
Finance       2      Child     1
Quality       4      Parent 
process       5      Child     4
processes     6      Child     4
Purchasing    7      Child     1
testFold      8      Child     7

As you see there are subfolder and inside it another subfolders. when the parent folders clicked, the event view the subfolders and the parent folders disappear, and when i try to click on the sub folders, every thing is disappeared and not reading the event handler. Please help me.