[SalesForce] Task related List Visual Force

If you are not against using some simple jQuery on your VF page, this works for me in my dev org:

<apex:includeScript value="https://ajax.googleapis.com/ajax/libs/jquery/1.10.1/jquery.min.js"/>

        <script>

            $vfjq = jQuery.noConflict();

            $vfjq(document).ready(function() {
                $vfjq('form').on('click', 'div', function(event) {
                    var i = setInterval(function() {
                        if ($vfjq("input[value='Cancel']").css('display').indexOf('none') !== -1) {
                            $vfjq("input[value='Submit for Approval']").show();
                        } else {
                            $vfjq("input[value='Submit for Approval']").hide();
                        }
                        clearInterval(i);
                    }, 200);
                });
            });

        </script>

You can do this by setting the subject attribute of apex:relatedList.

For example:

The component can be written to accept the account record as an attribute passed into it.

<apex:component>
  <apex:attribute name="acctRec" type="Account" description="The Account passed in"/>
  <apex:relatedList subject="{!acctRec}" list="Opportunities"/>
</apex:component>

The VF Page can pass the account record.

<apex:page standardController="Account">
    <c:testComponent acctRec="{!account}" />
</apex:page>

The result will be that the Opportunities for the Account specified by the id parameter will be displayed within the component.