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
*         are equal and one of them has a local value. Return null, if
	 *         elements have different value for the property or none of them
	 *         has a local value.
	 */
	public String getLocalStringValue( )
	{
		Object value = getLocalValue( );
		if ( value == null )
			return null;
		DesignElementHandle element = (DesignElementHandle) handle
				.getElements( ).get( 0 );
		String localValue = propDefn.getStringValue( element
				.getEffectiveModule( ), value );
		return localValue;
	}
	/**
	 * Value will be returned only if all values of this property are equal
	 * within the collection of elements and one of them has a local value.
	 * 
	 * @return The value if all the element values for the property are equal
	 *         and one of them has a local value. Return null, if elements have
	 *         different value for the property or none of them has a local
	 *         value.
	 */
	protected Object getLocalValue( )
	{
		if ( !shareSameValue( ) )
			return null;
		List elements = handle.getElements( );
		for ( int i = 0; i < elements.size( ); i++ )