[2005] Event handler never called.

[GlenW]

No, that's not it, this.getThumbnails must be called every time to create and populate the ImageButtons. The delegate for the event handler will, or should, ensure it is called no matter if new ImageButtons are created.

Just to make sure I added an IsPostBack check and didn't create the new Imagebuttons, this had no effect, the handler was still not called.

[GlenW]

This does work, what is wrong with the first one?

    protected void Page_Load(object sender, System.EventArgs e)
    {
      this.addButton();
    }

    private void addButton()
    {
      ImageButton lButton = new ImageButton();
      lButton.ID = "Click";
      lButton.Click += new ImageClickEventHandler(lButton_Click);
      this.pnlMain.Controls.Add(lButton);
    }

    void lButton_Click(object sender, ImageClickEventArgs e)
    {
      ImageButton lButton = sender as ImageButton;
      Response.Write(lButton.ID);
    }