Delegate an event in a usercontrols

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I have a Web User Control ClassSel;
There is a button1 in it, and I declare a delegate in it:

I drag this user control to MyWebForm, and add an event handler to the
ClassSel1.Afterclick

But it always say the Afterclick is null in run time.

How can I solve this problem?

---Web User
Control---------------------------------------------------------------------
----------------------
public delegate void _AfterClick();

public partial class ClassSel_ascx : System.Web.UI.UserControl
{
public int iYears, iClassID;
public event _AfterClick AfterClick;

protected void Button1_Click(object sender, EventArgs e)
{
....

AfterClick();
}
------MyWebForm.cs----------------------------------------------------------
-----------------
void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{

ClassSel1.AfterClick += new _AfterClick(myAfterClick);
ddlSt.Visible = false;
}
else
{
ddlSt.Visible = true;
lbShow.Visible = true;
}

}
public void myAfterClick()
{
ddlSt.Visible = true;

}