or
Here is the Ajax request event which I used to call on my another control click: /// <summary>
/// Handles the AjaxRequest event of the RadAjaxManager1 control.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The <see cref="Telerik.Web.UI.AjaxRequestEventArgs"/> instance containing the event data.</param>
protected void RadAjaxManager1_AjaxRequest(object sender, AjaxRequestEventArgs e)
{
//UserControl treelist = (UserControl)this.FindControl("serverComptDetailsView");
UpdatePanel updPanel = (UpdatePanel)serverComptDetailsView.FindControl("upPanel");
RadTreeList treelist = (RadTreeList)serverComptDetailsView.FindControl("gvCustomerMonitorFailures");
CEntronRestServiceClient serviceClient = new CEntronRestServiceClient();
RequestOfint request = new RequestOfint();
request.Data = Convert.ToInt32(e.Argument.ToString());
ResponseOfMonitoringDataFailureDTOHGZ00jlC response = new ResponseOfMonitoringDataFailureDTOHGZ00jlC();
response = serviceClient.GetMonitoringDataFailureDetailByDeviceID(request);
treelist.DataSource = response.Result;
}
<%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %><br><telerik:RadTreeView ID="RadTreeView1"<br> runat="server" TriStateCheckBoxes="true" CheckBoxes="true" CheckChildNodes="false"><br> <Nodes><br> <telerik:RadTreeNode Text="hello" Value="hello"></telerik:RadTreeNode><br> <telerik:RadTreeNode Text="hello1" Value="hello1" Selected="true" Checked="true"><br> <Nodes><br> <telerik:RadTreeNode Text="hello11" Value="hello11"></telerik:RadTreeNode><br> <telerik:RadTreeNode Text="hello12" Value="hello12"></telerik:RadTreeNode><br> <telerik:RadTreeNode Text="hello13" Value="hello13"></telerik:RadTreeNode><br> </Nodes><br> </telerik:RadTreeNode><br> <telerik:RadTreeNode Text="hello2" Value="hello2"></telerik:RadTreeNode><br> <telerik:RadTreeNode Text="hello3" Value="hello3"></telerik:RadTreeNode><br> </Nodes><br> </telerik:RadTreeView>RadTreeView1.ClearCheckedNodes();<br>RadTreeNode trnode = RadTreeView1.GetAllNodes().Where(tn => tn.Text=="hello1").FirstOrDefault();<br> trnode.Selected = true;<br> // trnode.Checkable = true;<br> trnode.Checked = true;