Hi all this is my code snippets.
Am trying to do grouping in dropdownfield.
So i had follow this linkhttps://examples2.ext.net/#/Form/Dro...ield/Overview/
The problem now am facing during the creation of accordian an merging in it to the ddn

"Ext.Net.DropDownField cannot use Content"

Please can any one tell me what could be the problem.

this is my aspx code
<ext:FormPanel ID="FormContTemplate" runat="server" Frame="true" Cls="bordernone">
        <Items>
            <ext:Container ID="ContTemplate" runat="server">
            </ext:Container>
        </Items>
    </ext:FormPanel>
This is my code behind
       Container container = new Container();
        Ext.Net.DropDownField combo = new Ext.Net.DropDownField();
        combo.ID = "CompoTemplate" + 1;
        combo.IndicatorCls = "red-text";

        Ext.Net.Panel panel = new Ext.Net.Panel();
        panel.ID = "Panel1";
        panel.Height = 200;
        panel.Layout = LayoutType.Accordion.ToString();

        Ext.Net.MenuPanel menuPanel = new Ext.Net.MenuPanel();
        menuPanel.ID = "MenuPanel1";

        Ext.Net.Menu menu = new Ext.Net.Menu();
        menu.ID = "Menu1";

        Ext.Net.MenuItem menuItem1 = new Ext.Net.MenuItem();
        Ext.Net.MenuItem menuItem2 = new Ext.Net.MenuItem();
        Ext.Net.MenuItem menuItem3 = new Ext.Net.MenuItem();

        menu.Items.Add(menuItem1);
        menu.Items.Add(menuItem2);
        menu.Items.Add(menuItem3);

        menuPanel.Add(menu);

        panel.Items.Add(menuPanel);

        combo.ContentContainer.Controls.Add(panel);

        container.Items.Add(combo);
        ContTemplate.Items.Add(container);
        //container.Render();