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/GroupPropertyHandle.java
* Set the object value on a group of elements. This operation will be
	 * executed within a transaction, it will be rollbacked if any set operation
	 * failed.
	 * 
	 * @param value
	 *            the object value to set
	 * @throws SemanticException
	 *             if the property is undefined on an element or the value is
	 *             invalid.
	 * @see PropertyHandle#setValue(Object)
	 */
	public void setValue( Object value ) throws SemanticException
	{
		assert handle.getModule( ) != null;
		ActivityStack actStack = handle.getModule( ).getActivityStack( );
		actStack.startTrans( );
		try
		{
			for ( Iterator iter = handle.getElements( ).iterator( ); iter
					.hasNext( ); )
			{
				DesignElementHandle elemHandle = (DesignElementHandle) iter
						.next( );
				elemHandle.setProperty( propDefn.getName( ), value );
			}
		}
		catch ( SemanticException e )
		{
			actStack.rollback( );
			throw e;