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/command/LibraryCommand.java
parent.dropDerived( child );
		value.unresolved( value.getName( ) );
		return overriddenValues;
	}
	/**
	 * Recursively collect all the descendents of the given element.
	 * 
	 * @param tmpElement
	 *            a given element.
	 * @param results
	 *            the result list containing all the childs.
	 */
	private void getAllDescdents( DesignElement tmpElement, List results )
	{
		List descends = tmpElement.getDerived( );
		results.addAll( descends );
		for ( int i = 0; i < descends.size( ); i++ )
		{
			getAllDescdents( (DesignElement) descends.get( i ), results );
		}
	}
	/**
	 * drop the include library structure.
	 * 
	 * @param fileName
	 *            file name of the library.
	 * 
	 * @param namespace
	 *            namespace of the library.
	 *