The Loader attribute of Ext. Net. Panel is used to reference the page.

The Panel uses the Loader method to call the page for content loading.
Note the following key points:

Home page:

<ext:ResourceManager ID="ResourceManager1" runat="server">    </ext:ResourceManager>    <ext:Panel ID="Panel1" runat="server" Title="Parent" Height="300" Width="500">        <Items>            <ext:Button ID="Button1" runat="server" Text="Button1" OnDirectClick="btn1_Click">            </ext:Button>                 </Items>        <Loader ID="Loader1" runat="server" Url="Child.aspx" Mode="Html" Scripts="true" />        <Buttons>            <ext:Button ID="Button2" runat="server" Text="Button2" OnDirectClick="btn2_Click" />        </Buttons>    </ext:Panel>

Background code:

protected void btn2_Click(object sender, DirectEventArgs e)        {                      Panel1.Loader.Visible = false;            Panel1.Update();        }        protected void btn1_Click(object sender, DirectEventArgs e)        {            Panel1.Loader.Visible = true;            Panel1.Update();        }

Subpage:

<ext:ResourceManager ID="ResourceManager1" runat="server" RenderScripts="None">    </ext:ResourceManager>    <ext:Panel ID="Panel2" runat="server" Title="Child" Width="300" Height="185" Frame="true">        <Items>            <ext:Label ID="Label2" runat="server" />        </Items>        <Buttons>            <ext:Button ID="btnChild" runat="server" Text="Submit [DirectEvent]">                <DirectEvents>                    <Click OnEvent="btnChild_Click" Url="Child.aspx" />                </DirectEvents>            </ext:Button>            <ext:Button ID="Button1" IDMode="Ignore" runat="server" Text="Submit [DirectMethod]">                <Listeners>                    <Click Handler="App.direct.ButtonClickChild({ url: 'Child.aspx' });" />                </Listeners>            </ext:Button>        </Buttons>    </ext:Panel>

Background code:

 protected void btnChild_Click(object sender, DirectEventArgs e)        {            this.Label2.Text = "Child [DirectEvent]: " + DateTime.Now.ToLongTimeString();            X.Msg.Alert("DirectEvent", "Child Button Clicked").Show();        }        [DirectMethod]        public void ButtonClickChild()        {            this.Label2.Text = "Child [DirectMethod]: " + DateTime.Now.ToLongTimeString();            X.Msg.Alert("DirectMethod", "Child Button Clicked").Show();        }