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
*/
	private List getMinPropDefns( )
	{
		int min = Integer.MAX_VALUE;
		List rtnPropDefns = Collections.EMPTY_LIST;
		for ( int j = 0; j < elements.size( ); j++ )
		{
			Object item = elements.get( j );
			if ( !( item instanceof DesignElementHandle ) )
				return Collections.EMPTY_LIST;
			List propDefns = ( (DesignElementHandle) item ).getElement( )
					.getPropertyDefns( );
			if ( propDefns.size( ) < min )
			{
				min = propDefns.size( );
				rtnPropDefns = propDefns;
			}
		}
		return rtnPropDefns;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.api.GroupElementHandle#isSameType()
	 */
	public boolean isSameType( )
	{
		if ( elements.size( ) == 0 )
			return false;
		IElementDefn baseDefn = null;