Bug 188578 Add "displayColumnName" on TabularLevel
Add Property "displayColumnName" on TabbularLevel and corresponding APIs on handle. Property Type: expression.
model/org.eclipse.birt.report.model.tests/test/org/eclipse/birt/report/model/parser/TabularCubeParserTest.java
checkNotificationStatus( listener );
		propHandle = cube
				.getPropertyHandle( TabularCubeHandle.ACCESS_CONTROLS_PROP );
		propHandle.drop( 0 );
		checkNotificationStatus( listener );
		assertEquals( 1, cube.getListProperty(
				TabularCubeHandle.ACCESS_CONTROLS_PROP ).size( ) );
		
		openDesign( FILE_NAME_EXTENDS );
		cube = (TabularCubeHandle) designHandle.findCube( "testCube1" ); 
		cube.addListener( listener );
		
		Iterator cubeAccess = cube.accessControlsIterator( );
		AccessControlHandle tmpAccess = (AccessControlHandle) cubeAccess.next( );
		tmpAccess.setPermission( DesignChoiceConstants.ACCESS_PERMISSION_ALLOW );
		checkNotificationStatus( listener );
	}
	/**
	 * When cube1 extends another cube2. Get access control from cube1.
	 * 
	 * <ul>
	 * <li>set permission
	 * <li>add role
	 * <li>remove role
	 * </ul>
	 * 
	 * will copies access controls from cube2 first. Then change the
	 * corresponding value. Undo is also tested.
	 * 
	 * @throws Exception