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
*         exists with the given name.
	 * @see PropertyHandle
	 */
	public PropertyHandle getPropertyHandle( String propName )
	{
		if ( propName == null )
			return null;
		DesignElement element = getElement( );
		ElementPropertyDefn propDefn = element.getPropertyDefn( propName );
		if ( propDefn == null )
			return null;
		
		if ( propDefn.getTypeCode( ) == IPropertyType.ELEMENT_TYPE )
		{
			if ( propHandles == null )
				propHandles = new HashMap( );
			if ( propHandles.get( propDefn.getName( ) ) != null )
				return (PropertyHandle) propHandles.get( propDefn.getName( ) );
			PropertyHandle pHandle = new PropertyHandle( this, propDefn );
			this.propHandles.put( propDefn.getName( ), pHandle );
			return pHandle;
		}
		return new PropertyHandle( this, propDefn );
	}
	/**
	 * Returns a user-defined property handle for a top-level property. A
	 * top-level property is a property that defines on an element.
	 * 
	 * @param propName
	 *            the name of the property to get