reference object from code behind

Hello,
Need help to reference an object from aspx and code behind page:
I am using an electronic signature pad with the following <Object> tag in my aspx page:

<object id="SigPlus1" style="left: 0px; width: 360px; top: 0px; height: 67px;"
                  classid="clsid:69A40DA3-4D42-11D0-86B0-0000C025864A" name="SigPlus1"
                    title="Electronic Signature Box">
                  <param name="_Version" value="131095"/>
                  <param name="_ExtentX" value="8467"/ ...