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/SimpleGroupElementHandle.java
*/
	protected boolean allExtendedElements( )
	{
		if ( elements.isEmpty( ) )
			return false;
		for ( Iterator iter = elements.iterator( ); iter.hasNext( ); )
		{
			Object next = iter.next( );
			if ( !( next instanceof DesignElementHandle ) )
				return false;
			DesignElementHandle elementHandle = (DesignElementHandle) next;
			
			if ( ( elementHandle.getExtends( ) == null )
					&& ( elementHandle.getElement( ).getBaseId( ) <= 0 ) )
				return false;
		}
		
		return true;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.api.GroupElementHandle#isPropertyReadOnly(java.lang.String)
	 */
	protected boolean isPropertyReadOnly( String propName )
	{
		for ( int i = 0; i < elements.size( ); i++ )
		{
			PropertyHandle propertyHandle = ( (DesignElementHandle) elements
					.get( i ) ).getPropertyHandle( propName );