How to use ajaxcontroltoolkit object from master page into default page

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Ajax

C#3.5

Hi,

I want to use Scriptmanager object defined in master page of a class library. That class library is been referred in another web application and the application master page is referencing to class library's master page. Now I want to add a attribute to scriptmanager from the web application. Currently I am doing like this:-

Class Library's code:-

protected void Page_Init(object sender, EventArgs e)
        {
            objscriptManager = new AjaxControlToolkit.ToolkitScriptManager();
            objscriptManager.ID = "scripManager";
            objscriptManager.CombineScripts = false;

         }

Web application code:-

protected void Page_Load(object sender, EventArgs e)
        {
            AdminPage a = new AdminPage();
            a.objscriptManager.EnablePartialRendering = true;
        }

In wen application I am trying to change the "EnablePartialRendering" attribute of scriptmanager to true;

Could some one help me with this code. After doing this I am getting error for Null reference in the web application.

Thanks