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
actStack.rollback( );
				throw e;
			}
			actStack.commit( );
		}
		else
			setValue( null );
	}
	/**
	 * Tests if this property is an extension defined property.
	 * 
	 * @return <code>true</code> if this property is an extension defined
	 *         property, <code>false</code> otherwise.
	 */
	boolean isExtensionModelProperty( )
	{
		for ( Iterator iter = handle.getElements( ).iterator( ); iter.hasNext( ); )
		{
			DesignElementHandle elemHandle = (DesignElementHandle) iter.next( );
			if ( elemHandle instanceof ExtendedItemHandle
					&& ( (ExtendedItem) elemHandle.getElement( ) )
							.isExtensionModelProperty( propDefn.getName( ) ) )
				return true;
		}
		return false;
	}
	
	/**
	 * Tests if this property is an extension defined xml property.
	 *