/**
 *	Apttus CPQ Approval
 *	CartViewController
 *	 
 *  @2012-2013 Apttus Inc. All rights reserved.
 */
public with sharing class CartViewController  {
	// context id
	private ID contextId = null;
    // approval type
    private String approvalType = null;
	/**
	 * Class Constructor 
	 * @param stdController the standard controller
	 */
    public CartViewController(ApexPages.StandardController stdController) {
    	// get context id
		contextId = stdController.getId();
		
		// get default approval context type
		//approvalType = SystemUtil.getDefaultApprovalCtxType();
		approvalType = 'cart';
    }
	/**
	 * Gets context object Id
	 */
	public ID getCtxObjectId() {
		return contextId;
	}
	/**
	 * Gets cart approval context type
	 */
	public String getCtxApprovalType() {
		return approvalType;
	}
}

<apex:page standardController="Apttus_Proposal__Proposal__c"
	extensions="CartViewController">
	<apex:form >
		<apex:pageMessages id="errorPage" />
		
		<apex:outputPanel id="idApprovalContextPanel">
			<Apttus_CQApprov:ApprovalContextView contexSOId="{!ctxObjectId}" 
				contextApprovalType="{!ctxApprovalType}"/>
		</apex:outputPanel>
	</apex:form>
</apex:page>