Hi Sir, I'm using RadPanelBar in my project I've keep RadPanelBar HTML Code in UserControl for using it in different pages (See Sample Project : leftmenu.ascx) Problem 1 ======== Instead of loading UserControl(leftmenu.ascx) in client side like below <%@ Register TagPrefix="uc1" TagName="leftmenu" Src="~/leftmenu.ascx"%> //Register <uc1:leftmenu id="ucjsradleftmenu" runat="server"></uc1:leftmenu> //Placing User Control If i Load it in Page Load Dynamically as shown below UserControl leftuc = (UserControl)LoadControl("~/leftmenu.ascx"); placeleftmenu.Controls.Add(leftuc); Then If we select Concern Page using mouse where Dynamic Code Exist(Sample Project : RadComboBox.aspx) mouse selected(RadComboBox) not selecting properly Visual Studio used : Microsoft Visual Studio 2008 Version 9.0.30729.1 SP Dot Net Framework : Microsoft .NET Framework Version 3.5 SP1