ASP Panel loses its controls

[Bobi]

Hi, Support

i have a dynamically added repeater to asp Panel control (see the code below)

DataRepeater.ID = String.Format("DR{0}", ItemID);
DataRepeater.DataSource = oToDoList;
DataRepeater.DataBind();

foreach (RepeaterItem RItem in DataRepeater.Items)
{ ... }

pnlNiches.Controls.Add(DataRepeater);

This is working good, repeater is added to asp Panel. But, when I try to retrieve repeater items, it appears that panel doesn't contain any control.

Repeater DataRepeater = (Repeater)pnlNiches.FindControl(String.Format("DR{0}", ItemID));
if (DataRepeater != null)
{
    foreach (RepeaterItem RItem in DataRepeater.Items)
    { ... }
}

I am sure that I don't clear panel controls in the code.
What can be the reason of this strange behavior? Thanks in advance!