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/DesignElementHandle.java
{
			return null;
		}
		assert 0 <= slotID && slotID < slotCount;
		if ( slotHandles == null )
		{
			slotHandles = new SlotHandle[slotCount];
			for ( int i = 0; i < slotCount; i++ )
			{
				slotHandles[i] = null;
			}
		}
		if ( slotHandles[slotID] == null )
		{
			slotHandles[slotID] = new SlotHandle( this, slotID );
		}
		return slotHandles[slotID];
	}
	/**
	 * Returns an iterator over the properties of this element. This handle
	 * returns all properties defined on this element, whether or not they are
	 * actually set on this element.
	 * 
	 * @return an iterator over the properties. Each call to
	 *         <code>getNext( )</code> returns an object of type
	 *         {@link PropertyHandle}.
	 * @see PropertyIterator
	 * @see PropertyHandle
	 * @see UserPropertyDefnHandle
	 */