I'm completely new to ASP.Net so...

I created a user control with some fields on it. I want to add it to a page in Page_Load. I'm assuming that this is the place to do it.
So I dropped a panel on the page, then in Page_Load I have:

Params_AssCumLtDetail Params = new Params_AssCumLtDetail();
pnlParams.Controls.Add(Params);

When I run it, I don't see anything.

When I do this:

Label myLabel = new Label ( );
myLabel.Text = "Sample Label"
pnlParams.Controls.Add ( myLabel );

The label appears.

So what's wrong here?