Bug 185898 ReportItemHandle needs to add two method: getAvailableDataBindingReferenceList and getDataBindingType.
ReportItemHandle needs to add two method: getAvailableDataBindingReferenceList and getDataBindingType. The first method provider the available ReportItem list of DataBindingReference. The second method provider the type of the DataBinding.
model/org.eclipse.birt.report.model.tests/test/org/eclipse/birt/report/model/api/ReportItemHandleTest.java
tableCol.setAggregateOn( "All" );
		tableCol.setDataType( DesignChoiceConstants.PARAM_TYPE_STRING );
		tableHandle.addColumnBinding( tableCol, false );
		List boundList = tableHandle
				.getListProperty( IReportItemModel.BOUND_DATA_COLUMNS_PROP );
		assertEquals( 2, boundList.size( ) );
		assertEquals(
				"data item1", ( (ComputedColumn) boundList.get( 0 ) ).getName( ) );
		assertEquals(
				"NewGroup", ( (ComputedColumn) boundList.get( 0 ) ).getAggregateOn( ) );
		assertEquals(
				"data item2", ( (ComputedColumn) boundList.get( 1 ) ).getName( ) );
		assertEquals(
				"All", ( (ComputedColumn) boundList.get( 1 ) ).getAggregateOn( ) );
	}
	/**
	 * Test to read hide rules.
	 * 
	 * @throws Exception
	 *             if open the design file with errors.
	 */
	public void testReadVisibilityRules( ) throws Exception
	{
		openDesign( "ReportItemHandleTest.xml" ); 
		LabelHandle labelHandle = (LabelHandle) designHandle
				.findElement( "bodyLabel" ); 		
		Iterator rules = labelHandle.visibilityRulesIterator( );
		
		StructureHandle structHandle = (StructureHandle) rules.next( );
		assertNotNull( structHandle );