Bug 121498 When datasource/dataset deleted, the datasource/dataset property binding element haven't been deleted
When deleted the datasource/dataset, the datasource/dataset property binding element haven't been deleted. Expected result: This operation must be a transaction.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/command/ContentCommand.java
* @throws SemanticException
	 *             if the old element cannot be replaced by the new element into
	 *             this container.
	 */
	private void doReplace( DesignElement oldElement, DesignElement newElement,
			int slotID, boolean unresolveReference ) throws SemanticException
	{
		assert newElement.getContainer( ) == null;
		
		ElementDefn metaData = (ElementDefn) element.getDefn( );
		if ( !metaData.isContainer( ) )
			throw new ContentException( element, slotID,
					ContentException.DESIGN_EXCEPTION_NOT_CONTAINER );
		SlotDefn slotInfo = (SlotDefn) metaData.getSlot( slotID );
		if ( slotInfo == null )
			throw new ContentException( element, slotID,
					ContentException.DESIGN_EXCEPTION_SLOT_NOT_FOUND );
		if ( !slotInfo.canContain( newElement ) )
			throw new ContentException( element, slotID, newElement,
					ContentException.DESIGN_EXCEPTION_WRONG_TYPE );
		
		if ( element.isContentOf( newElement ) )
			throw new ContentException( element, slotID, newElement,
					ContentException.DESIGN_EXCEPTION_RECURSIVE );
		if ( slotID == Module.COMPONENT_SLOT )
		{
			if ( StringUtil.isBlank( newElement.getName( ) ) )
				throw new ContentException( element, slotID, newElement,
						ContentException.DESIGN_EXCEPTION_CONTENT_NAME_REQUIRED );
		}