Bug 176436 Charts Imported from Libraries do not update when libraries change
During a live presentation of BIRT at EclipseCon, we came across a rather embarassing issue. When charts are included in a library, and imported into a report design from a library, any changes to the library instance of the chart do not reflect in the report itself.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/GroupElementHandle.java
* @return <code>true</code> if each of the given collection of element
	 *         extends has a parent. Returns <code>false</code> otherwise. If
	 *         the collection has no elements, also return <code>false</code>
	 */
	abstract public boolean isExtendedElements( );
	/**
	 * This method returnt <code>true</code> in following condition:
	 * <p>
	 * 1. The multi selected elements are same type.
	 * <p>
	 * 2. And the multi selected elements have extends.
	 * <p>
	 * 3. If any of the given elements has local properties.
	 * <p>
	 * 
	 * @return <code>true</code> if the conditions is met.
	 */
	public final boolean hasLocalPropertiesForExtendedElements( )
	{
		if ( !isSameType( ) )
			return false;
		if ( !allExtendedElements( ) )
			return false;
		List elements = getElements( );
		for ( Iterator iter = elements.iterator( ); iter.hasNext( ); )
		{
			DesignElementHandle elementHandle = (DesignElementHandle) iter
					.next( );
			Iterator propIter = elementHandle.getPropertyIterator( );
			while ( propIter.hasNext( ) )