Bug 119566 Support template items in page header/footer
Currently you can't create template report items inside a page header/footer. This should be fixed.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/core/DesignElement.java
protected int containerSlotID = NO_SLOT;
	/**
	 * Listeners are the objects that want to be notified of events. Contents
	 * are of type Listener. Created only when needed.
	 */
	protected ArrayList listeners = null;
	/**
	 * Values for non-intrinsic property values. The contents are of type
	 * Object.
	 */
	protected Map propValues = new HashMap( );
	/**
	 * Definitions for user-defined properties. Contents are of type
	 * UserPropertyDefn.
	 */
	protected HashMap userProperties = null;
	/**
	 * Support for inheritance. Represents the resolved or unresolved element
	 * that this element extends.
	 */
	protected ElementRefValue extendsRef = null;
	/**
	 * Inverse of the extends relationship: parent-->derived. Very few elements
	 * are extended, so we create this list only when needed.
	 */
	protected ArrayList derived = null;
	/**
	 * The unique ID assigned to this element when it is added to the design.
	 * Allows web applications to refer to the element by ID.
	 */