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/extension/PeerExtensibilityProvider.java
* @return the value of the given property. If the property is not found, or
	 *         the value is not set, return null.
	 */
	public Object getExtensionProperty( String propName )
	{
		if ( isExtensionXMLProperty( propName ) && hasOwnModel( propName ) )
		{
			if ( reportItem != null )
			{
				ByteArrayOutputStream stream = reportItem.serialize( propName );
				if ( stream == null )
					return null;
				String retValue = null;
				try
				{
					retValue = stream.toString( UnicodeUtil.SIGNATURE_UTF_8 );
				}
				catch ( UnsupportedEncodingException e )
				{
					assert false;
				}
				return retValue;
			}
		}
		else if ( isExtensionModelProperty( propName ) )
		{
			
			
			assert reportItem != null;
			return reportItem.getProperty( propName );