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
structHandle = (StructureHandle) rules.next( );
		assertNotNull( structHandle );
		memberHandle = structHandle.getMember( HideRule.FORMAT_MEMBER );
		assertEquals( DesignChoiceConstants.FORMAT_TYPE_PDF, memberHandle
				.getStringValue( ) );
		
		memberHandle = structHandle.getMember( HideRule.VALUE_EXPR_MEMBER );
		assertNull( memberHandle.getStringValue( ) );
	}
	/**
	 * Tests to write hide rules to the design file.
	 * 
	 * @throws Exception
	 *             if open/write the design file with IO errors.
	 */
	public void testWriteVisibilityRules( ) throws Exception
	{
		openDesign( "ReportItemHandleTest.xml" ); 
		LabelHandle labelHandle = (LabelHandle) designHandle
				.findElement( "bodyLabel" ); 		
		Iterator rules = labelHandle.visibilityRulesIterator( );
		
		StructureHandle structHandle = (StructureHandle) rules.next( );
		assertNotNull( structHandle );
		MemberHandle memberHandle = structHandle
				.getMember( HideRule.FORMAT_MEMBER );
		memberHandle.setValue( DesignChoiceConstants.FORMAT_TYPE_REPORTLET );
		
		try
		{