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
stack.startTrans( addRecord.getLabel( ) );
		try
		{
			
			if ( addTemplateParam != null )
				stack.execute( addTemplateParam );
			
			stack.execute( addRecord );
			
			
			addElementNames( content );
		}
		catch ( NameException e )
		{
			stack.rollback( );
			throw e;
		}
		stack.commit( );
	}
	/**
	 * Adds the element name and names of nested element in it to name spaces.
	 * 
	 * @param content
	 *            the content to add
	 * @throws NameException
	 *             if any element has duplicate name with elements already on
	 *             the design tree.
	 */
	private void addElementNames( DesignElement content ) throws NameException
	{