>> Dim radModels As Telerik.Web.UI.RadComboBox = DirectCast(Me.DateRangeSelector1.FindControl("radModels"), Telerik.Web.UI.RadComboBox) >> For Each item As Telerik.Web.UI.RadComboBoxItem In radModels.Items >> Dim chk As CheckBox = DirectCast(item.FindControl("chk1"), CheckBox) >> If item.Text <> ModelName Then >> chk.Checked = False >> Else >> chk.Checked = True >> End If >> Next >>>I don't have the Telerik stuff and I see the RadComboBoxItem overrides the native WebControl.FindControl() method (http://www.telerik.com/help/aspnet/combobox/radcombobox-telerik.webcontrols.radcomboboxitem-findcontrol.html) without descibing how the behaviour is changed. Anyway it's not clear to me where you're problem really lies.