I have Placeholder within Update panel. On Page_Load i load user contol via this code:
Code:
Control ctrl = LoadControl("~/UserControls/ListViewThumbs.ascx");
ucThumbs = (ListViewThumbs)ctrl;
ucThumbs.ID = "ucThumbs";
ucThumbs.SelectedIndexChanged += new UserControlSelectedIndexChanged(listView_SelectedIndexChanging);