Bug 120317 Set "dimension" property to 3D in "properties" view, error appears in layout editor.
Description: Set "dimension" property to 3D in "properties" view, error appears in layout editor. Steps to reproduce: 1. Add a 2D chart in property editor. 2. Set its dimension property to "three-dimension" in properties view. 3. Error appears in chart.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/ExtendedItemHandle.java
* @throws ExtendedElementException
	 *             if the serialized model is invalid
	 */
	public void loadExtendedElement( ) throws ExtendedElementException
	{
		( (ExtendedItem) getElement( ) ).initializeReportItem( module );
	}
	/**
	 * Returns the interface <code>IReportItem</code> for extension.
	 * 
	 * @return the interface <code>IReportItem</code> for extension
	 * 
	 * @throws ExtendedElementException
	 *             if the serialized model is invalid
	 */
	public IReportItem getReportItem( ) throws ExtendedElementException
	{
		IReportItem reportItem = ( (ExtendedItem) getElement( ) )
				.getExtendedElement( );
		if ( reportItem == null )
		{
			loadExtendedElement( );
			reportItem = ( (ExtendedItem) getElement( ) ).getExtendedElement( );
		}
		return reportItem;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.birt.report.model.api.IExtendableElementHandle#getExtensionPropertyDefinitionList()