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/DesignElementHandle.java
/**
	 * Drops a content element from the container, and unresolve any reference
	 * property which refers the element to drop.
	 * 
	 * @param propName
	 *            name of the property where the content resides
	 * @param content
	 *            a handle to the content to drop
	 * @throws SemanticException
	 *             if the content is not within the container
	 */
	public void drop( String propName, DesignElementHandle content )
			throws SemanticException
	{
		if ( content == null )
			return;
		ContentCommand cmd = new ContentCommand( getModule( ),
				new ContainerContext( getElement( ), propName ) );
		cmd.remove( content.getElement( ), true );
	}
	/**
	 * Drops a content element at the given position from the container, and
	 * clear any reference property which refers the element to drop.
	 * 
	 * @param propName
	 *            name of the property where the content resides
	 * @param posn
	 *            the position of the content to drop
	 * @throws SemanticException
	 *             if the position is out of range