ImageClickEvenHandler doesn't call handler - asp.net

Question

I have a dynamically created table and in some of the cells i have an image button associated with the redBall_Click() handler
(here is the code behind)
TableCell cellOK = new TableCell();
cellOK.Style.Add(HtmlTextWriterStyle.TextAlign, "Center");
cellOK.Width = new Unit("3%");
ImageButton redBall = new ImageButton();
redBall.CausesValidation = false;
redBall.ID = id;
redBall.ImageUrl = "~/App_Themes/DotRed.png";
redBall.Click += new ImageClickEventHandler(redBall_Click);
cellOK.Controls.Add(redBall);
My problem is that the redBall_Click() method is never called (neither after the PostBack)
How can i solve this?
P.S. : I can't use a static link because every ImageButton is associated with a specific ID that i must pass to the page i call (for example as a Session object)

Answer 1

You have to set up the event handler within OnInt and do it every time the page is created, even during a postback. Make sure you don't have the code within a block like:
if(!this.IsPostback)
{
...
}

Answer 2

Have you tried putting a breakpoint in the page load method before clicking the image? I suspect this might show that the postback is happening, even if the image click handler isn't getting fired.
Is the code to create the image button also invoked during a postback? If not, the page will postback, but the image button won't exist to invoke the click handler. Sounds bizarre, but it's caught me out a few times.

Answer 3

I finally resolved (just yesterday).
I guess I was building my buttons too late: in the Page_PreRender (after the event was to be fired) maybe if i put the creation in Page_Load (yes, I create everything also on PostBack) it would handle the click, but I think I won't try since I found a workaround.
I'll explain for anyone who could have the same problem:
private TableCell cellOK(string id)
{
TableCell cellOK = new TableCell();
cellOK.Style.Add(HtmlTextWriterStyle.TextAlign, "Center");
Image redBall = new Image();
redBall.ID = id; // useless
redBall.ImageUrl = "redball.gif";
HyperLink hl = new HyperLink();
hl.Controls.Add(redBall);
hl.NavigateUrl = MyPage + "?id=" + id;
cellOK.Controls.Add(hl);
return cellOK;
}
and in Page_Init()
string m_QueryStringId = Request.QueryString.Get("id");
if (!string.IsNullOrEmpty(m_QueryStringId))
{
// Do something
}