accessing a web user control in master page

Hi,i have a web user control called StudentsPanel in my master page.I have palced it under the login view as shown below

<asp:LoginView ID="LoginView1" runat="server">
                  <RoleGroups>
                <asp:RoleGroup Roles="Students">
                    <ContentTemplate>
                        <uc1:studentPanel runat="server" ID="students_control" /> 
                    </ContentTemplate>
                     </asp:RoleGroup>
               
                </asp:RoleGroup>
            </RoleGroups>
        </asp:LoginView>

I need to access the control in my aspx page such that i can disable it on page load.I have tried using the code below but am getting null results.Please someone guide me on this,Below is the code i am using but keeps getting null

LoginView control;

             Page page = (Page)this.Page;
             MasterPage master = (MasterPage)page.Master;

           control= (LoginView)master.FindControl("students_control"); 

                        if (control!= null)
                        {
                            Label1.Text = "found";
                        }

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