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
for ( int i = 0; i < elements.size( ); i++ )
		{
			Object item = elements.get( i );
			if ( !( item instanceof DesignElementHandle ) )
				return false;
			IElementDefn elemDefn = ( (DesignElementHandle) item ).getDefn( );
			if ( baseDefn == null )
				baseDefn = elemDefn;
			if ( elemDefn != baseDefn )
				return false;
		}
		return true;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.api.GroupElementHandle#visiblePropertyIterator()
	 */
	public Iterator visiblePropertyIterator( )
	{
		List list = getCommonProperties( );
		final List visibleList = new ArrayList( );
		for ( int i = 0; i < list.size( ); i++ )
		{
			IElementPropertyDefn propDefn = (IElementPropertyDefn) list.get( i );
			if ( isPropertyVisible( propDefn.getName( ) ) )
			{
				visibleList.add( propDefn );
			}
		}