FindControl with MasterPage, Content, and

I have a MasterPage, Content, and aspx page within the Content.
I need to find a control using the string ID of the control to be found.


<%@ Page Language="C#" MasterPageFile="~/MasterPage.master"
AutoEventWireup="true" CodeFile="UploadImage.aspx.cs"
Inherits="UploadImage"  Title="Upload Images" Debug ="true" %>

<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
    <title>HoldemMyWay Helper</title>
   
     <style type="text/css">
        .style2
        {
            margin-right: 0px;
        }
        </style>
</asp:Content>

<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder" Runat="Server">

<b>HoldemMyWay Helper </b>&nbsp;

<asp:ImageButton ID="cmdc1Clip" runat="server" Height="32px"
        ImageUrl="~/CardImages/c1Clip.gif" Width="25px" OnClick="cmdc1Clip_Click"/>    <br />
    <br />

====
The following syntax compiles but returns a null value for the control.
and the following error:
Object reference not set to an instance of an object.

 ImageButton MyControl = (ImageButton)this.Master.FindControl("Content2").FindControl("ContentPlaceHolder").FindControl("cmdc1Clip");  

What do you suggest?

Thank you,