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
*/
	public void testUndoInvalidStyle( ) throws Exception
	{
		openDesign( "ReportItemHandleTest.xml" );  
		TextItemHandle textHandle = (TextItemHandle) designHandle
				.findElement( "myText" ); 
		textHandle.setStyleName( "My Style" ); 
		designHandle.getCommandStack( ).undo( );
		assertEquals( "unknownStyle", textHandle 
				.getStringProperty( ReportItem.STYLE_PROP ) );
		assertEquals( null, textHandle
				.getElementProperty( ReportItem.STYLE_PROP ) );
		assertEquals( null, textHandle.getStyle( ) );
	}
	/**
	 * Tests the undo operation for invalid DataSet name.
	 * 
	 * @throws Exception
	 *             if any exception
	 */
	public void testUndoInvalidDataSet( ) throws Exception
	{
		openDesign( "ReportItemHandleTest.xml" );  
		TextItemHandle textHandle = (TextItemHandle) designHandle
				.findElement( "myText" ); 
		textHandle.setProperty( ReportItem.DATA_SET_PROP, "myDataSet" ); 
		designHandle.getCommandStack( ).undo( );
		assertEquals( "unknownDataSet", textHandle 
				.getStringProperty( ReportItem.DATA_SET_PROP ) );
		assertEquals( null, textHandle