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
return null;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see java.lang.Object#clone()
	 */
	public Object doClone( CopyPolicy policy )
			throws CloneNotSupportedException
	{
		ExtendedItem clonedElement = (ExtendedItem) super.doClone( policy );
		clonedElement.provider = new PeerExtensibilityProvider( clonedElement,
				clonedElement.extensionName );
		clonedElement.provider.copyFrom( provider );
		return clonedElement;
	}
	/**
	 * Tests whether the property is a dynamic property of extended element or
	 * not.
	 * 
	 * @param propName
	 *            the property name to check
	 * @return true if the property is one of the dynamic properties for
	 *         extended element, otherwise false
	 */
	public boolean isExtensionModelProperty( String propName )
	{
		if ( provider != null )
			return provider.isExtensionModelProperty( propName );
		return false;