MenuItem Click event is not working

[krishna]

.CS File (Codebehind code)
-------------------------------------------------------------------------

private void LoadMenu()
        {
            UserServiceClient UserService = new UserServiceClient();
            try
            {
                ModuleMaster[] mm;
                mm = UserService.SelectModuleBasedOnUserName("user");


                MenuPanel objMenuPanel = new MenuPanel();
                objMenuPanel.Title = "Patient";
                objMenuPanel.IconCls = "mnu-patientScheduling-icon16";
                objMenuPanel.Collapsed = true;
                objMenuPanel.AutoScroll = false;
                objMenuPanel.AutoHeight = true;
                objMenuPanel.SaveSelection = false;
                objMenuPanel.ID = "MP_" + "111";
                for (int i = 0; i < mm.Length; i++)
                {
                    Ext.Net.MenuItem objMenuItem;
                    if (mm[i].ModuleGroupName == "user")
                    {
                        objMenuItem = new Ext.Net.MenuItem();
                        objMenuItem.ID = "MI_" + mm[i].ModuleID.ToString();
                        //objMenuItem.ClientID = "MI_" + mm[i].ModuleID.ToString();
                        objMenuItem.IconCls = mm[i].MenuIconClass;
                        objMenuItem.Text = mm[i].ModuleName;
                        objMenuItem.DirectEvents.Click.Event += MenuItem_Click;
                        objMenuItem.AutoPostBack = false;
                        objMenuPanel.Menu.Items.Add(objMenuItem);
                    }
                }
                if (objMenuPanel.Menu.Items.Count > 0)
                {
                    Panel2.Items.Add(objMenuPanel);
                    // this.Items.Add(objMenuPanel);
                }
            }
            catch (Exception ee)
            {
                WebPageException.HandleException(ee, "DesktopUiError");
            }
          
        }
        protected void MenuItem_Click(object sender, Ext.Net.DirectEventArgs e)
        {
        }

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.Aspx page
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<ext:Viewport ID="Viewport1" runat="server" Layout="border">
        <Items>
        
      
                <ext:Panel ID="Panel2" 
                    runat="server" 
                    Width="350" 
                    Layout="Accordion" 
                    Split="true" 
                    Region="West" 
                    Margins="5 0 5 5" 
                    DefaultBorder="false" CollapseMode="Mini" Collapsible="true">
                    <Items>
                      
                    </Items>
                </ext:Panel>
                <ext:Panel 
                    ID="pnlCenter" 
                    runat="server" 
                    Title="Selected Item" 
                    Padding="5" 
                    Region="Center" 
                    Margins="5 5 5 0" 
                    ></ext:Panel>
                    
                    
            </Items>
            </ext:Viewport>

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In the above provided code, i am creating Dynamically MenuItems it's created. But i am unable to find the MenuItemID on the click of MenuItem.
It's throughing the error --- The control with ID 'ctl00_ContentPlaceHolder1_MI_48' not found

How to solve this, Any Ideas Please reply as soon as possible.