Telerik-RadRadioButtonlist control is not loading

Question

<telerik:RadPanelBar runat="server" Visible="true" Border="false" ID="pnlMain" Width="600px">
    <Items>
        <telerik:RadPanelItem runat="server">
            <ItemTemplate>
                <telerik:RadTextBox runat="server" ID="tfName" Label="Partner / Client Group Name:"
                    Display="true" LabelWidth="180px" Width="600px" />
                <telerik:RadLabel runat="server" ID="RadioLabel" Text="Partner / Client Group:"                Visible="true" />
                <telerik:RadRadioButtonList ID="rgPcg" runat="server" Direction="Horizontal">
                    <Items>
                        <telerik:ButtonListItem runat="server" Text="Partner" Selected="true" Value="Partner"/>
                        <telerik:ButtonListItem runat="server" Text="Client Group" Value="Client Group"/>
                  </Items>
               </telerik:RadRadioButtonList>
            </ItemTemplate>
        </telerik:RadPanelItem>
   </Items>
</telerik:RadPanelBar>

`Why my control RadRadioButtonList 'rgPcg' is not loading while we run the application and other two controls(tfName,RadioLabel) are displaying fine. it's not showing in designer.cs page as well.

I have placed same control in other screens and those are working fine. but in this screen it is not working.

Please help me in this. `