HTMLEditor AJAX not visible after upgrade to framework4.0

Hello Team,

Recently we have upgraded .net framework 3.5 to 4.0

We were using AJAX - HTMLEditor

In localhost its working normal, but when we host to server it display noting.

no error....

Above Head Tag:

<%@ Register TagPrefix="HTMLEditor" Namespace="AjaxControlToolkit.HTMLEditor" Assembly="AjaxControlToolkit"%>

In Body - form Tag:

    <asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server"></asp:ToolkitScriptManager>

 <HTMLEditor:Editor ID="Editor1" runat="server"   
        Height="300px"   
        Width="300"  
        AutoFocus="true"  
        ActiveMode="Design"
        
/>

Any suggests!