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/elements/ExtendedItem.java
}
	/**
	 * Tests whether the property is just the model property for the extended
	 * element, and its type is XML.
	 * 
	 * @param propName
	 *            the property name to check
	 * @return true if the property is XML type and it is model property for
	 *         extended element, otherwise false
	 */
	public boolean isExtensionXMLProperty( String propName )
	{
		if ( provider != null )
			return provider.isExtensionXMLProperty( propName );
		return false;
	}
	/**
	 * returns the methods defined on this element and defined in the extension
	 * model.
	 * 
	 * @return the method list
	 */
	public List getMethods( )
	{
		if ( provider != null )
			return provider.getModelMethodDefns( );
		return getDefn( ).getMethods( );
	}
	/**
	 * Returns the script property name of this extended item.